They will generally do this firmware update for free if you send the receiver in.

It also pays to use high quality receiver batteries with plenty of mAh capacity and low internal impedance for less voltage drop under load. If a plane is large enough to handle the extra few ounces, a second battery pack in parallel is helpful. The main thing though is to be absolutely sure your receiver battery is in good condition and fully charged. That means no "quick 15 minute charges" on a wall charger right before flying and periodic checks with a meter that applies a slight load while at the field.

I was not aware of the capacitor being available. I may have to buy a few. Or maybe I will just buy one, to find out the size and rating then pick some up at the local electronics store to make my own.

To be honest, I have never personally heard of this problem happening on sport and trainer type airplanes with standard servos but as you get into high performance digitals on large aerobatic planes, good power supply becomes critical.