Sub keeps popping in and out

[NeoClassic]

i've got two subs in he back of my truck. they have worked fine for years, but today one of them started doing something weird. it will gradually push out, then pop back in. even with volume down all the way it will keep doing this so long as the stereo is on, so i hear a thump every 10 seconds or so.

ideas?

thanks

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[maylar 10+ year member]

Sounds like amp issues.