Hi @osdecar I assuming you use the mobile split cable with a power bank yes ?
When connecting via USB C … and not the single cable … that is important .
You should have no less frames via WiFi ,
Sometimes the phone"s updates affecting the OTG settings on the phone that can cause an issue as well .
Anyway make sure you confirm the connection type you used with the power bank as a single cable can’t powering the scanner and send data at the same time on the phone or for that matter many motherboards can’t either despite they are modern .