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I have had it happen where the guide corrections start to oscillate - ging +ve then -ve and it appeared to be correcting its last correction.
What it boiled down to (apart from probably a slight amount of backlash) was the scope was too well balanced. I adjusted the balance slightly so the weight made the scope tip slightly to the east to load up the gears more.
It then stopped. I think also the cam adjusmtent with the threaded tension rods probably need a bit of tweaking as you may have them a bit loose or they go loose over time. This 3 way switch, cam, threaded rod system of the PMX is one of the weak spots of the mount design and I think they may go a bit loose over time and may need tightening occassionally.
Anyway its worth a try in case its something else.
I use from 1 to 6 second guide exposures. If its windy I go 1 sec. If its still I go around 5 seconds with aggressiveness set to around 5-7.
Greg.
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