Bought my Spider Valve 112 a few years ago when it first came out, then noticed that it started to stop working after about an hour/two hours of continuous play. Sometimes it would stop working in as short as 30 mins depending on the season (I'm currently in S.E. Asia). Since the warranty was up, I read up on this and decided to try adding heatsinks to keep the DSPs cool - the result was this:

Works like a charm now - no more intermittent failures. Also got a local carpenter to make a new cab for it since the original Line 6 didn't allow much in terms of ventilation for cooling the DSPs.

Hope this is helpful to those who are experiencing similar problems.