ArdupilotMega stopped working suddenly

Hello everyone

I bought an ardupilotmega, 7-8 months ago and installed it on my hand made plane and was working well. (all modes were working properly). 2 weeks ago I had a very bad crash. there is not any sign of damage or defect on the boards. but when I use it with my new model airplane(tl 2000 sting, 28cc gas), it does not work properly. Yesterday I tested it in over 8 flights. in 2 of the flights it was working all right( all modes working) but in the other 6 flights it did not work at all. it is very weird for me that sometimes it works and sometimes doesn't. What's the problem you think? is it possible to be a hardware defect because of that crash?

Thanks

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