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I took the liberty to look up your relay and it is indeed a ptc relay
part #WR08X10034 retail price is $82.35. since your compressor is starting sometimes it's probably not the relay ....it really sound like your compressor is
getting tight...not a good thing.
ummm I have done domestic refer repair for about 35 years now and as far as I know they have used ssr aka ptc relays almost exclusively for at least the past 10 to 15 years..... and yes when they burn out they do indeed break down internally and rattle. So a quick check to see if the relay is...
Your relay is likley a solid state relay usually when they go bad they will rattle when you shake them. the older mechanical relays have a visable copper winding on them I doubt yours is that old. If your relay doesn't rattle then you likely have a bad compressor