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How is the power feed done? A good practice is to power the mount separately from Asiair and not power the mount via Asiair.
Also, if the whole setup is directly connected to a wall outlet and if you want to exclude any power fluctuation, use a battery powered station, even a UPS.
For PA, there is a setting in Asiair to remember it, so you don't have to do it each time your start it.
The spike can be caused by many things incl weather, guiding app issue, guiding equipment issues, mechanical issues with the mount etc. You haven't mentioned what scope is the above setup used with. Also, best to post an example image with the issue. Might help the troubleshooting.
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