This would be characteristic if the battery is failing. Try a new battery. Batteries fade out and then they tend to recover if not used for a few minutes. The only real way to test the battery is with a brand new one. Try that first IF you have not done so.
One other problem is if the output jack is going bad. The jack is a stereo type and they use the ring connection on it to ground the battery to turn it on. If that contact gets marginal, then the battery voltage to the preamp collapses and sound fades out.
It is UNLIKELY there is a problem with the pickups causing this. A cracked circuit board could also do this but I don't think it would wait 20 minutes. Delays like that point to the battery. DO NOT believe any battery indicators... they OFTEN lie !!!
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