websocket not update data - version 5.1

Hi Anton,
I have problems with updating the status of the vehicles on the map, it is observed in the browser console that the websocket is not updating data in real time, only update by pressing F5, and then still not updating websocket.
the problem is solved when I restart the traccar services

https://www.traccar.org/forums/topic/auto-update-map-in-v-51/

Hi Anton,
the preview version https://www.traccar.org/preview/, solved the problem
thank you very much for your help