welcome to the INDI forum! There seem to be dithering problems before. See your log file, there are several occasions that show "Settling failed". I've observed the same behavior, but I do not have the answer what the root source is - it might come from PHD2 and not necessarily from EKOS. I'll take a look over the weekend when I have my log files at hand.
TSA-120 + FSQ-85 + ONTC 10"F4 Newton + epsilon-160 | Avalon Linear + M-zero | ASI 1600mm pro + 6200mm pro | KStars/INDI on Raspberry Pi 4/Intel NUC