Radio module resetting when fluorescent tube switched on/off
I'd suggest placing a tiny capacitor across the reset line to earth, say 100pf or larger, but that may impact how your design performs normally resets.  Alternatively, reduce your pull down resistor from 10K to say 1K...  The fluorescent tube start generates large spikes that affect, and your reset line looks susseptible with a high impedance .  The design of your circuit board in crucial too.. as your whole power supply circuit board should only have one earth connection to chassis..