I too have had alot of trouble with these servos this year.
Seven in total burnt out all used as throttle in gas boats.
Worst part is a bunch were sent out for service to the Canadian repair center ( HIFHIGHT ) they lost package 2 months ago and till I called last week they never had it listed in there system

They just found it today and since they no longer are an authorized repair center they are sending it to hitec, heck if I new that I would have sent it to them myself.

Now I am out of backup servos as I used on in a new build that only lasted a few min till it also went south.
Now have three boats down that use the same servo and have to send more in for repair.
Worst part is that I am comitted to using that size servo and I have a race coming up in 2 weeks and LHS want $40CDN for a 225mg +tax.
What to do.
Most are probaly out of warriny time frame thow not used till this year as they were backups.