I've been having problems with my internet connection over the past weeks (intermittent disconnections, slow transfers, etc), and my provider keeps telling me that the problem is not on their end.

I have cablemodem with a wifi router (this router was not provided by them).

The router is quite old (DIR-300), so I'm starting to wonder if it could be the issue and if I should replace it.

Is it possible that it is the cause? Can they become so outdated that they cause intermittent interruptions of service?

If I reset the modem and the router, they work fine for a few hours, but the problems starts again after a while.