Devo 7e Low Power Transmission

Hello to all, after many times I return with a problem on my modded Devo7e.
In the last night I pickup my radio to make a flight but after 5 meters my UR65 go down with low signal alarm, I have tested my Mobula7 but same thing happened.
I have opened the radio and checked antenna connection with tester, coaxial and shield are perfectly connected on the main board.
What's the problem? Main TX module are gone?
I use to fly DSMX and a power modded Devo7e, I have fly it for many years without problem ...
The only strange thing I did was turn on the two drones at the same time to watch a setting on OSD, after this came out the problem of low power, is it just a coincidence or can do trouble two receivers on? I don't think this is possible though ....
Now the only solution is to change the TX module? Is it convenient to install a 4in1 module at this point?
Thanks to all guys, have a nice day.

Indeed default devo 7e has power limitation, after you mod the module and bridge the resistor it should be full range. You need also to set the power level. (and possible in hardware ini "HAS PA")

but for me devo7e works really fine.

Thanks Fernandez, yes I have made the bridge mode some years ago, modified ini files and all works perfect with long range, until a few days ago, then suddenly this problem.