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Mine has done this from day one of owning the boat after sitting in "float mode" at the sandbar - depth takes a few minutes to come back. Not sure if this is the same issue that you're experiencing or not.
I’m having the issue with less than 4 hrs on the boat. Did you ever find the root cause?
I haven't been out yet to check. When new, I had many electrical problems that were solved with some mystery grounding solution and @Stealth mentioned some electrical stuff that led me to think I should check all the connections. I recently did some sound insulation that might have loosened or dislodged something. I also installed a fish finder last year and have been messing with the signal settings, it might be causing some interference. Those are my next troubleshooting steps.
