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Hi Victor,
Any chance that what you are guiding on is crossing the meridian?
Happens a lot to me at winter time and the mount/PHD go nutso if I cross too far over and I dont remember to re-learn PHD on that side of the meridian.
Either that, or the mount/OTA may be out of balance? Check it first with the clutches loosened (and all the camera / scope gear on) and see if its side heavy or grossly out of balance. This will cause the HEQ5 to happily start guiding, but as it leans over and loads up the gears, can start to slip and carry on like you explained. I noticed this on mine with the camera and guidescope etc, until I bought another smaller counterweight to add to my 2 that came with the scope, then, problem sorted.
Give these a go.
Cheers
Chris
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