I presume it is the cartridge causing the problem ?
Hard to say, but I do know that some of the entry-level laser printers combine replaceable parts in order to save space and/or money.
For example, on larger devices you'd typically find toner, imaging unit, transfer unit, fuser are all separate items with different lifespans... however these are often combined in entry-level devices which means you're more reliant on manufacturing tolerances.
That's my theory at least......
