Device connected/disconnected every few seconds

2026-09-13 18:48:46  WARN: [T53fc26f0] error - index: 26, length: 10304 (expected: range(0, 124)) - IndexOutOfBoundsException (... < IotmProtocolDecoder:54 < *:133 < *:180 < BaseMqttProtocolDecoder:73 < ExtendedObjectDecoder:72 < ... < WrapperContext:102 < ...)
2026-09-13 18:48:46  INFO: [T53fc26f0] disconnected
2026-09-13 18:49:44  INFO: [T61a7c5aa] connected
2026-09-13 18:49:45  INFO: [T61a7c5aa: iotm < 79.100.61.77] 101f00044d51545404c200f0000f38363935393530363933323138363600000000
2026-09-13 18:49:45  INFO: [T61a7c5aa: iotm > 79.100.61.77] 20020000
2026-09-13 18:49:45  INFO: [T61a7c5aa: iotm < 79.100.61.77] 8219000400143836393539353036393332313836362f4f55544301
2026-09-13 18:49:45  INFO: [T61a7c5aa: iotm > 79.100.61.77] 90020004
2026-09-13 18:49:46  INFO: [T61a7c5aa: iotm < 79.100.61.77] 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
2026-09-13 18:49:46  WARN: [T61a7c5aa] error - index: 26, length: 10304 (expected: range(0, 124)) - IndexOutOfBoundsException (... < IotmProtocolDecoder:54 < *:133 < *:180 < BaseMqttProtocolDecoder:73 < ExtendedObjectDecoder:72 < ... < WrapperContext:102 < ...)
2026-09-13 18:49:46  INFO: [T61a7c5aa] disconnected
2026-09-13 18:51:41  INFO: [T41bb0622] connected
2026-09-13 18:51:45  INFO: [T41bb0622: iotm < 95.42.71.21] 101f00044d51545404c200f0000f38363935393530363933323138363600000000
2026-09-13 18:51:45  INFO: [T41bb0622: iotm > 95.42.71.21] 20020000
2026-09-13 18:51:46  INFO: [T41bb0622: iotm < 95.42.71.21] 8219000200143836393539353036393332313836362f4f55544301
2026-09-13 18:51:46  INFO: [T41bb0622: iotm > 95.42.71.21] 90020002
2026-09-13 18:51:47  INFO: [T41bb0622: iotm < 95.42.71.21] 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
2026-09-13 18:51:47  WARN: [T41bb0622] error - index: 26, length: 10304 (expected: range(0, 124)) - IndexOutOfBoundsException (... < IotmProtocolDecoder:54 < *:133 < *:180 < BaseMqttProtocolDecoder:73 < ExtendedObjectDecoder:72 < ... < WrapperContext:102 < ...)
2026-09-13 18:51:47  INFO: [T41bb0622] disconnected
2026-09-13 18:52:41  INFO: [T47e8fd18] connected
2026-09-13 18:52:41  INFO: [T47e8fd18: iotm < 95.42.71.21] 101f00044d51545404c200f0000f38363935393530363933323138363600000000
2026-09-13 18:52:41  INFO: [T47e8fd18: iotm > 95.42.71.21] 20020000
2026-09-13 18:52:42  INFO: [T47e8fd18: iotm < 95.42.71.21] 8219000300143836393539353036393332313836362f4f55544301
2026-09-13 18:52:42  INFO: [T47e8fd18: iotm > 95.42.71.21] 90020003
2026-09-13 18:52:43  INFO: [T47e8fd18: iotm < 95.42.71.21] 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
2026-09-13 18:52:43  WARN: [T47e8fd18] error - index: 26, length: 10304 (expected: range(0, 124)) - IndexOutOfBoundsException (... < IotmProtocolDecoder:54 < *:133 < *:180 < BaseMqttProtocolDecoder:73 < ExtendedObjectDecoder:72 < ... < WrapperContext:102 < ...)
2026-09-13 18:52:43  INFO: [T47e8fd18] disconnected
2026-09-13 18:53:40  INFO: [Tf2eca67e] connected
2026-09-13 18:53:40  INFO: [Tf2eca67e: iotm < 95.42.71.21] 101f00044d51545404c200f0000f38363935393530363933323138363600000000
2026-09-13 18:53:40  INFO: [Tf2eca67e: iotm > 95.42.71.21] 20020000
2026-09-13 18:53:41  INFO: [Tf2eca67e: iotm < 95.42.71.21] 8219000400143836393539353036393332313836362f4f55544301
2026-09-13 18:53:41  INFO: [Tf2eca67e: iotm > 95.42.71.21] 90020004
2026-09-13 18:53:42  INFO: [Tf2eca67e: iotm < 95.42.71.21] 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
2026-09-13 18:53:42  WARN: [Tf2eca67e] error - index: 26, length: 10304 (expected: range(0, 124)) - IndexOutOfBoundsException (... < IotmProtocolDecoder:54 < *:133 < *:180 < BaseMqttProtocolDecoder:73 < ExtendedObjectDecoder:72 < ... < WrapperContext:102 < ...)
2026-09-13 18:53:42  INFO: [Tf2eca67e] disconnected
2026-09-13 18:54:54  INFO: [Tfba6e014] connected
2026-09-13 18:54:58  INFO: [Tfba6e014: iotm < 95.43.151.22] 101f00044d51545404c200f0000f38363935393530363933323138363600000000
2026-09-13 18:54:58  INFO: [Tfba6e014: iotm > 95.43.151.22] 20020000
2026-09-13 18:55:17  WARN: [Tfba6e014] error - Connection reset - SocketException (...)
2026-09-13 18:55:17  INFO: [Tfba6e014] disconnected
2026-09-13 18:55:25  INFO: [T7ca217b8] connected
2026-09-13 18:55:29  INFO: [T7ca217b8: iotm < 95.42.1.198] 101f00044d51545404c200f0000f38363935393530363933323138363600000000
2026-09-13 18:55:29  INFO: [T7ca217b8: iotm > 95.42.1.198] 20020000
2026-09-13 18:55:30  INFO: [T7ca217b8: iotm < 95.42.1.198] 8219000200143836393539353036393332313836362f4f55544301
2026-09-13 18:55:30  INFO: [T7ca217b8: iotm > 95.42.1.198] 90020002
2026-09-13 18:55:31  INFO: [T7ca217b8: iotm < 95.42.1.198] 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
2026-09-13 18:55:31  WARN: [T7ca217b8] error - index: 26, length: 10304 (expected: range(0, 124)) - IndexOutOfBoundsException (... < IotmProtocolDecoder:54 < *:133 < *:180 < BaseMqttProtocolDecoder:73 < ExtendedObjectDecoder:72 < ... < WrapperContext:102 < ...)
2026-09-13 18:55:31  INFO: [T7ca217b8] disconnected
2026-09-13 18:56:54  INFO: [T4611ccd7] connected
2026-09-13 18:57:01  INFO: [Ta4cc3093] connected
2026-09-13 18:57:11  WARN: [Ta4cc3093] error - Connection reset - SocketException (...)
2026-09-13 18:57:11  INFO: [Ta4cc3093] disconnected
2026-09-13 18:57:11  INFO: [T9f7b14f0] connected
2026-09-13 18:57:11  INFO: [T9f7b14f0: gps103 < 185.223.235.31] 57000000001111070000ffff030000fe03000014001c080a0800000000000000040101010000000001
2026-09-13 18:57:21  WARN: [T9f7b14f0] error - Connection reset - SocketException (...)
2026-09-13 18:57:21  INFO: [T9f7b14f0] disconnected
2026-09-13 18:57:50  INFO: [T2411130f] connected
2026-09-13 18:57:54  INFO: [T2411130f: iotm < 90.154.209.4] 101f00044d51545404c200f0000f38363935393530363933323138363600000000
2026-09-13 18:57:54  INFO: [T2411130f: iotm > 90.154.209.4] 20020000
2026-09-13 18:57:55  INFO: [T2411130f: iotm < 90.154.209.4] 8219000200143836393539353036393332313836362f4f55544301
2026-09-13 18:57:55  INFO: [T2411130f: iotm > 90.154.209.4] 90020002
2026-09-13 18:57:56  INFO: [T2411130f: iotm < 90.154.209.4] 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
2026-09-13 18:57:56  WARN: [T2411130f] error - index: 26, length: 10304 (expected: range(0, 124)) - IndexOutOfBoundsException (... < IotmProtocolDecoder:54 < *:133 < *:180 < BaseMqttProtocolDecoder:73 < ExtendedObjectDecoder:72 < ... < WrapperContext:102 < ...)
2026-09-13 18:57:56  INFO: [T2411130f] disconnected

Could you tell me why this happens? The device was working normally before, and then suddenly stopped transmitting data.

Do you have the documentation?