Random loss of connection with podium

[Red Camel Racing]

Last weekend we had a 24H race in Misano
Setup sim card etc.. all works
However during the race we lost the connection between car and podium several times.
Not just pausing for a moment but status no connection and it didn't recover.
Only when I perform a power cycle the connection recovers.

for endurance this annoying because we loose time with power cycle the car.

Additionally when podium reports no connection, the module still flashes it leds like it is transmitting data succesfully

Is this a known issue and perhaps any solutions