Artifactual troughs and flickers in recorded stream depth

Beginning two weeks ago (September 2) my EnviroDIY station (VCRP1) equipped with a METER CTD sensor began displaying troughs and flickers in recorded stream depth that don’t correspond to true c

Beginning two weeks ago (September 2) my EnviroDIY station (VCRP1) equipped with a METER CTD sensor began displaying troughs and flickers in recorded stream depth that don’t correspond to true changes in depth as actually measured. Weirdly, the troughs and flickers occur at precisely the same times in almost precisely the same patterns on a diurnal basis, as if they’re linked to some clock function. I see no relation to variations in cellular signal strength, and the battery charge is fine. I’ve attached a photo of a few days of the data. Any ideas??

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