You should not have problems like this, I have had mine for about a year now and tbh I have had one servo go bad in that period, yes they need cleaning often but they are not to bad, the board is another thing, people have had issues and I had an issue with mine a few weeks ago, but not a guarantee that my board was bad as I had a poss problem with my lynx tail servo at the same time,
How do you fly the heli,
One battery after the other or do you give it a fair time to cool,
I say this as the board because the speed control and bec and gyros are all in one it tends to get warm, and i think this is the problem for many people that have board issues, I fly mine for 3.30 mins and then leave it cool for 10 mins, and hence I don't have so many issues, I have flown probably 150 batteries through mine and with very little problems,