FWIW, I was in a similar situation as the original poster last year. Had an Arcam AVR600 that had numerous reliability issues over the years (overheating, fan noise, faulty switching, etc), but I kept holding onto it as it sounded great, and I figured it would cost an arm and a leg to replace it with something comparable.
It finally crapped out for good late last year, but after all the reliability issues I had the first time around, I didn’t wanted to spend anywhere near the $6,000 that an equivalent new Arcam AVR model cost.
I decided to try a Denon just to see how it compared sonically, and purchased an X3700H direct from the manufacturer for about $1200 on sale, figuring I could return it if I didn’t find it up to par.
To my surprise, not only did the Denon sound every bit as good as my old Arcam at one-fifth the cost, it also has way better functionality and a much more seamless overall experience (not surprising given the age of the Arcam). Runs way cooler and quieter as well.
I used to be a loyal Arcam user and have owned numerous of their products over the years (integrated amps, power amps, AVR, CD players) but as great as they sound, every one of them either had long term reliability issues or else died prematurely.
Personally, I’m done with this brand given all the issues I’ve had combined with the difficulty and expense of repairs, and getting the Denon was an eye opener in that you can get equally great sounding gear at much lower prices these days.