Whandall:
So it seems the transmitter is resetting.
You should try to find out why and how often that happens.Ok, read your note. No reason to chase a non existant bug.
Note that the receiver is not protected against packets that are too big and could crash if you
have bigger packets than 5 bytes on the used pipes (from your original sketches).
I could try sending less data to test that. However, when I tried sending data form just one IMU to the Receiver, using as address "30000" or "40000", no data is received, if I put it back to "10000" or "20000" then everything is fine and the data is received.