Look to your power. The printer runs on 220 because it’s more stable than 110. If not comfortable have an electrician do this for you. Remove the panel for your building have him put meters on the 220 breaker wires. Send a print. Not too worried about warm up. More curious when printer is running and toward the end of print. You may have 220v at idle but when the printer is running and needs to be consistent, you may be under or over the required power. You may need to have a buck boost transformer installed to stabilize your power. It’s often overlooked. But hit you are having head issues and trailing cable issues, I would say your issue is power. Especially after you just had a service and new head installed