Hi @Josephsinyor
Welcome to the Sonos Community!
Sorry to hear of this issue you are having with your Spotify alarm not playing properly.
Yes, resetting is when you hold the Bluetooth button while applying power - I do not recommend it as I cannot see how it would help, and it just creates more work (as you have discovered - there was no need to do it just to connect to a new router either).
I gather that you can manually select music from Spotify and play it, outside of setting an alarm? Please ensure that this is the case.
Please recreate the issue with the alarm and, after the alarm fails to play, please submit a support diagnostic, replying here when you have done so, but please don’t share the number given. Thanks.