Problem with Digitech Delay

[jrc4558]

Hey all!
I'm running several pedals in my pedals chain, all true mechanical bypass, but there's a DIY buffer before them to compensate for impedances and all. In the end of the chain there's a Digitech DigiDelay http://www.digitech.com/products/digidelay.htm
There's a mode on it, where you can tap the speed of repeats. I usually keep it in that mode permanently, because my band plays somewhat non-conventional musicand requires swift changes in the time signatures (think Konstruction of Light)... As of recently the following thing started occuring: I flip the standby switch, everything sounds fine for a minute or two, and then a loud hum begins, somewhere in the area of 60HZ, the guitar sound becomes very quiet and lo-fi with no treble at all. The hum DECREASES but doesn't completely disappear if I touch the chassis of an amp with one hand, while holding the strings on the guitar with my other hand. I suspect a ground interruption, since when I'm bypassing the ground of the pedal chain with my body, the hum gets weaker.
Funny part. After scratching my head for a couple of minutes I decided to 'reboot' my digital delay. I powered it down, pulled all the wires out and took out the battery. After waitinig for 10 or so seconds, I powered it back again and it WORKED!!! No hum ever occured for the next hour and a half or so, until we finished the rehearsal. I will be testing it more today, but I am still very concerned for two things:
a) What could be the cause of such weird behavior? (I'm using a Godlyke power adaptor, it shoots out 9VDC @ 1A, and I guess that's enough for the digital needs)
b) Are issues of grounding interruption common on long pedal chains? Should I create a bypass ground from before the buffer (first in the chain) to after the delay (last in the chain) The pedalchain is 11 pedals long.
Any help will be greately appreciated. Especially so, since we're palying a show on Saturday and I don't want to embarass our band with my failing DIY technolgy.

[jrc4558]

up

[jrc4558]

Problem solved. Bad electrolytic capacitor.