Restarting everything at once can break all kinds of subsystems. Even if the radio interference wasn't an issue here, you would still get high odds of them not connecting cleanly to the network because of something else.
Restarting everything should be a highly recommended test step before going to production, no matter what the system. Catches so many problems based on the assumptions that one may not fully realize. And some day it will have to be done anyway (unless the system is extremely redundant in all aspects), so best to test it sooner than later.