I have spotted the odd mention on this thread of problems with coupling/uncoupling these Evero units - is anything being done about this? I occasionally travel on services along the N. Wales Coast, and all my recent journeys have been delayed due to problems uncoupling units. Yesterday was particularly bad - we lost 30 minutes at Chester waiting for the sets to be uncoupled. No announcements explaining what was going on until just before we finally departed. And to rub salt into the wound, a TfW service to Holyhead left from another platform while we were all locked in.
Coupling and uncoupling also seems to cause problems with the seat reservation system. They usually all vanish once the sets are uncoupled at Chester. And going the other way, from Holyhead, it is common for the reservations to only get displayed after the sets are coupled at Chester.