Just curious, how much do you use the H10. Like hours per day (average). I got the V5s (both single and dual) very soon after they were released. I have no had any problems. I did install the heat spreader and put heat sinks on the regulators. The room probably averages 74 degrees F. I might average 2 hours per day, but have run it for 150 hours straight when breaking in headphones. I do run at 12 DB gain, which I think that was what Burson said produced the least heat in the Opamps. There are other settings NOT recommended for the gain switches.
I have had no problems to date.
This topic has been discussed at length earlier in the thread. It seems that the V5s are running at or beyond their rated voltage in the H10. Later ones, designated for the H10 were/are selected based on testing for voltage tolerance.
Also, I don't have it in front of me now, but the stock opamps... the specific types, is listed in many places earlier in the thread. I can't do it for you right now, but a quick search will get you that data... as well as documenting the potential causes for V5s failing.