OK I'm stumped here, I bought a 3 month PS Plus subscription and before it expired I bought another one but my games still expired. Does anybody know how to renew them?

Have you tried playing the expired game while connected to the internet, or re syncing your trophies? It may just need to re validate the licenses.

Kind of odd, mine always just worked again after I renewed the subscription.

Ye I was already connected but resyncing trophies did the trick, thanks!

If they didn't renew you should at least be able to redownload them.