Modbus connection fails during Remote Control

[otava5]

Good day,
lately it happens to me that when charging from the network via Remote Control, the communication with Modbus fails and then according to the graph it charges/discharges, charges/discharges.
The strange thing is that when charging is finished, Modbus works again.
Can you advise what to do with it. I have the impression that it started to get angry after a power outage...

13:42 modbus failure:

and here charging/discharging - crazy:

Note the first charge at 4h was fine
EDIT:
Here it looks like on/off charging:

Previously, when the modbus connection failed, restarting the router helped...

SOLAX X3-G4 (WIFI DONGLE) + HA - RPI 4B (WIFI connection).....
Thanks for any advice