A true R/C hobbyist should try to fix his stuff before considering getting a new one

Unfortunately true hobbyist are becoming a rare breed today
not to say we don't have talented people here.
I have been around R/C for over thirty years and since the
seventies when ARF's came out they started a following
good or bad. At least it gets the all thumbs people in the hobby
that have little building skills and Mr. Deep Pockets was always
here, he may pay someone to do his construction, you
will see this in scale.
As I see it ARF are good to hook more patrons in our sport
which is good for everyone as it keeps manufacturers going

.

You don't stop laughing because you grow old, you grow old because you stopped laughing.

Liron,
I have had similar problems, see my web page

To fix these problems I replaced the bearing and changed my tuning and after-flight habits. At first I was sure that it was rust, at least it looked like that in all respects. But afterwards I was not entirely sure; and the only part that really seemed rusted was the rear bearing, and even there - aren't bearings of stainless steel?