MKG

Model: MH 871-MK2 Since this morning while cutting, every time cartridge arm stuck for couple of seconds specially while making a weed box. Because of this it overlapped weed box on adjust decal. When I power it on, sometime cartridge not move to the right side just make some weird noise. I already changed the blade. put some oil on the belt. Also, opened from left side to visually inspect but it looks good. Any suggestions to resolve this issue. Thanks