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Doublecabin

Have recently installed a TM258 (3months ago) and replaced a DSM 300 with a CP 370 (6 weeks ago) running on a e140W.
Everything has been running good (Numerous trips)before yesterday. Yesterday loss bottom and scrolling at 65'. Kept running out 45 minutes or so and fished all day (anchored) at approx 100' with no accurate bottom. When anchored machine showed bottom occasionally at 0-30' when we were actually in 100'+. There was no scrolling of bottom, however just a bunch of what I would call interference. Re booted cp 370, e140w and entire system to no avail. Also checked tm258 for obstruction or movement and there was none. Stayed out in 100' for 5 hours with no sonar. On way back in at 65' (again) unit started working.
Someone at marina said this is not uncommon for ray and there is a fix?? I searched the forum and did not come up with anything specific.
Any suggestions to resolve this would be appreciated.