I've only had Cubes running overclocked for two or three weeks, but no issues past a single X'd card - just haven't had time to fix it. About half my cards have actually been jacked to a higher-than-factory overclock just because.
I have a Blade that's been in continual operation at 20% faster than these Cubes' overclock frequency, for two months without a single issue. The way I figure, as long as you keep them cool enough, they should last their expected (profitable) lifetime.
Also, effin' YES on the DDWRT. My last two wireless routers were both flashed to said firmware, and I have another running around which needs to be given "the treatment".
Thanks for your input. I have been "cycling" them for lack of a better word. I run them 8 hours on low and 8 hours on high. Perhaps its overkill but I sleep better by doing this

"The Treatment", I like how you put that. Yes, any flashable router that enters the house will not keep its OEM virginity for long

I am using BFGminer on RPi as proxy server. Running Corsair 750M power supply. Pool with Bitminter.
Can't figure out why the long poll shows inactive, when BFGminer setting is long poll = active.
Any ideas?
I have run into the same situation regarding the "Long Poll inactive" and have noticed that my stale share percentage is out of the desirable range. I was researching this and saw that Dogie made this comment below. Is there a short answer or any insight one of you could give regarding making my hardware & my stratum proxy "play nice". I am running the latest version of BFGMiner, my networking is cleaned up, exceptions made in any firewalls etc etc. Cant figure it out. I have tried 3-4 different pools to see if that would clear the problem up and still the same.
Your blade and stratum proxy aren't playing nice, hence 'long poll inactive'.