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e4 errors means fuser error, probably you encountered lots of fuser jamming.
the best thing to do is to ask your service provider to check your machine but for the mean time, you could erase the error log.
press function + orig. size + 3
find ram initialize
find LBP FUSER RESET
note: make sure that LBP FUSER RESET is the selected one
restart your machine
if you still encountered an e4 error, it means that there is a physical/hardware problem on your fuser unit.