Can car amps "rot out"?

I have a Pioneer GM-X404 amp from the 90s, that's giving me constant issues with the speaker connections. My front right speaker just keeps going offline, until I either wiggle the molex on the amp, or it sometimes comes back if I restart my stereo. Sometimes also the back speakers stop working. Also for whatever reason, if I turn on LPF for the sub on the amp, it disables my back speakers. Not sure if that's just intended function though.

Last year, I managed to fix the issue by getting a new molex for the speakers, but after a few months the issue has come back. Could the amp just simply be on it's last legs, or what is going on? The connector itself is very tight and not loose at all.