twitchy servo

[shartinspartin]

I was running my spartan today and hooked a fresh pack of lipos up after the first run and my servo was twitchy. It was like it was vibrating and buzzing. I messed with the trim on the tx and it kinda helped... I also noticed that the servo was kinda moving slow....
Whats the issue?
Im using tqi tx/rx
stock servo
Is there an upgrade servo if needed?

[Fluid]

How many times has the servo gotten wet?




.

[shartinspartin]

Im not sure... Probably everytime i used it... I bought it used and have only used it like 5 times.

I thought it was waterproof?