I went back and forth between woofers. M80 one worked, VP180 didn't. So if I wiggled it back on it would have been fixed after that. Can't be a wiggle problem, esp. with 2 woofers at once.

If it were the amp, why would the woofers stop working only and not the other speakers as well? Also, it happened while I was out of town and the amp was completely off.

Connections are all bananna connectors and are as secure as they could be with heavy gaugue wire.

One of the woofer works just barely. The other one not at all.

Amp is an Emotiva XPA-5. Not just a cheap amp.
Epson 8350 * Denon 4311CI * XPA-5 * M80/VP180 * 2 QS8's+M2v3-DSX * SVS PC13-Ultra ** Buttkicker LFE