pop off the cover from your servo and inspect for stripped gears, on some brands of servos, I've had luck by simply rotating the stripped gear by 180° to get it working just as good as new, depending on which gear was stripped.
Hitec offers top notch service for their servos, they actually make service repairs. I've been burned in the past by Savox USA, they refused to do any service work outside of warranty (stripped gears are not covered under warranty either) and they sent me to contact Savox Global (Taiwan) who never responded after several attempts and after 6 months went by, I gave up on Savox. I've since found Turnigy servos to work better for me, and should I strip a gear, it's just as easy to replace the servo than to mess with a warranty claim, far more cost effective and better performance (for me) than Savox in comparison:
If you continue to strip servo gears over time, it might be worth swapping brands of servo savers until you find one that provides better protection, I've been pretty happy with Kimbrough