Hi @GMack72
Welcome to the Sonos Community! And, apologies for the delay.
I’m sorry to hear of this issue you are having with resetting your Play:3 speaker.
Please connect the speaker that will not reset to your router with an ethernet cable and attempt the factory reset process once more. If this now works, you should not need to ever use an ethernet cable to reset this particular speaker ever again. If, on the other hand, it does not help, then the speaker likely has a fault - please get in touch with our technical support team to look into your replacement options.
I hope this helps.
Great answer i will give it a go when i return from holidays.