I got my printers belts changed Now it has started fixing the layers I've

I got my printers belts changed
Now it has started fixing the layers
I’ve tried tightening and loosening
x and y axis belts all it helped was that before it shifted on the second layer now it shifts after 30 minutes of printing
So if the print is less thn 30’or around 20 minutes it won’t shift the layer
Please help what to do
Thanx

Maybe it’s the stepper drivers getting too hot or drawing too much current. Have you checked to see if there is enough airflow/cooling on the electronics?