Hello I have a problem with my sena intercoms

I got one 50r and one sf2 (usb c version) paired together.

Everything always worked perfectly until yesterday when I updated both firmware.

Now, when I talk in my 50r everything works and the sf2 hear me perfectly but when the sf2 talk it’s like its mic have a delay before it activate.

It’s pretty annoying because on the sf2 we always have to blow in the mic to « keep him alive »

What can I do to correct that and have a constant communication ?

I tried to reset it and re-pair but it didn’t change anything.

I also tried to turn on/off the vox settings and adjust sensitivity but I notices no difference.

Thanks a lot in advance