My turn to ask for help: burning servos

[ziper_it]

Edit: Solved. Two servo damaged in crash and third one defective. Flying again.

So I crashed: lost orientation and, while trying to recover, heli rolled right (probably my mistake, but not sure). Heli stood on ground for a while before I could unpower it. Canopy and blades and spindle gone, plus two servos, for now.
Heli is with stock ESC and motor, BeastX, 5065 on cyclic and 5084 on tail.
First time I tried BX lights dimmed and turned off so I disconnected all servo and tried again.
Without servos rx was ok, motor was ok.
Rechecked BX configuration: ok
Reconnected one by one the servo, ail was no working an BX shutted down.
Replaced that servo, reconnected and pit stopped working.
Replaced pit servo, tried with unmounted servo. It worked fine so i mounted it. Servo got warm and I wasn't fast enough to disconnect.

Now I connected another one and is working, should I mount it?

First two servos were mounted at the time of the crash, the latest had a stripped gear that I replaced before trying it.

Any hints on next steps?

[eightythree]

Maybe try ruling out the rx, possible rx short?

Not that it would have anything to do with it, but is the ferrite ring installed on the esc?

[ziper_it]

Rx is an R6108SB (with 8FG), connected via SBUS to BX.
I've however tried to connect servos directly to rx (bench only) and it works.
I thought about a short on BX, but failing servos were on different channels. Connected a new servo yesterday, still unmounted in the frame and everything seems working. Don't know.

There is no ferrite ring on ESC, but never had any problem in more than 40 flights. Radio is 2.4G, but now wondering if this cannot be the source of my three crashes. This should be however unrelated to servo failures.

I've also noticed caps on ESC are a little bit scratched.