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I had this same issue with nearly every cargo bike in a fleet that I was maintaining for a courier firm. All running Bosch mid drive and NuVinci N360 with eHarmony shifting. Enviolo initially warrantied the eHarmony shifting interfaces that mount on the hub, gave us a whole new batch that were supposed to fix the issue, but ended up having the same problem down the line.
Never got to the bottom of the cause, but one time while on the phone to enviolo, I was told that its a known issue between them and Bosch, where the Bosch components have 'communication issues' with the enviolo shifter. Have you seen an error code at all on yours? (Assuming you also have a Bosch motor)
Eventually the courier firm bought a newer batch of updated cargo bikes, which came with the enviolo cable operated grip shifters instead of the eHarmony stuff. Overall these seemed more reliable, and at least easier to diagnose if problems came about (snapped cable, cables set up wrong etc), rather than an electrical issue that seemed unrepairable. So you might want to look into switching yours from eHarmony to the gripshift.
I would personally avoid the enviolo hubs for a cargo bike in the future though. Had lots of other issues. Enviolo are pretty helpful and were good with warranty, but as mentioned above, I don't think the hubs are up to use on a cargo.
oatmeal-
Cheers. Yes it is a Bosch mid drive. Never had error codes. I have already discussed converting it to a grip-shift - at my expense, which seems a bit rough as the test ride was on a UA with a grip-shift!
What concerns me is that Enviolo seem to think a new hub will fix the issue, guy at bike shop reckons it's not the hub but interface or servo.
Also when I gave Enviolo the hub serial number they said "This isn't a Cargo hub, but I expect it to be a Trekking". So there are different versions? And UA fit the wrong type?
ian(conker)
anyone on here have experience of Enviolo Harmony gearing? My first Enviolo hub lasted 6 months before sounding like a bucket of metal parts. The replacement - 6 months on & it randomly changes cadence, especially noticeable going uphill. Mechanic where I bought it thinks it isn't the hub, Enviolo have offered (another) replacement hub. All taking weeks to sort out, so very annoying