Moms mixer is about 4-5 years old. With lockdown goin on my girlfriend has been baking a significant amount and using the mixer, nothing too intense that it shouldn't handle with ease. The issue is when you add an attachment and lift the bowl, once turning the machine on the motor runs no problem but the mixing head struggles to move, and there seems to be no strain on anything but the mixing attachment. If you lower the bowl so it can spin freely there are no issues. Any ideas on what the issue might be?