Zigbee roller shutter issue

Hi Folks,

I’ve got some weird issue going on with my roller shutters (zigbee). The work well, but after some time it looks like they lost calibration.

I have an automation that closes them for 70% at 19.15. After a few weeks the same 70% closes them almost completly and when opening them 70% they (logic) don’t open fully.

The Zigbee switch i use is from the brand “BSEED” and looks like this:

The automation is based on the entity, not the device. (i tried both)

service: cover.set_cover_position
data:
  position: 30
target:
  entity_id: cover.blind_slaapkamer_l

Before this i had some Shelly 2.5’s and they were working rock solid, but to much hassle to get that behind a manual override switch, so for that reason the zigbee one.