Need some advice from the family. I use an Aguilar AG500 single channel amp (~10 years old) that has been a champ, but recently has been acting up a bit. Specifically, the amp cuts into protection mode (shuts off signal to speaker cabs) at random and intermittent times. It was the worst during an outdoor event last month that occurred on an extraordinarily hot day (90+ degrees). I contacted Aguilar a few weeks ago and they indicated that it definitely was not the fuse, and that it shouldn't be an overheating issue (even with the 90+ temps.) since the amp has a very large heat sink (no fan type unit). They said its probably best to ship it up to them for examination. Guessing that it is several weeks for any repair needed (and probably $$). The problem is that I started playing a bit more regularly lately (3x / month) and am using the amp / cabs set-up at places with little house systems. Used it last weekend and the amp was perfect all evening, even after pushing it up to 1:00 on the master 12:00 on gain. Planning to try it out again this Friday at a similar type venue. Questions: 1. Do you guys always carry a back-up for smaller gigs without house systems?? Somewhat low on cash and never really thought about having a backup amp (500 watt) just to have in emergency? Never had a problem before. 2. Could this be a cord / connection issue? I am still using 1/4" jacks that are in really good shape and seem to connect fine. I always thought about getting Speakon cables, but never had the need with the current set-up. Any advice would be appreciated!