Possibly a fuser issue. Check by sending a 1 pg document to printer and opening cover when paper picked from tray but before it enters fuser. if image good then problem caused by fuser and you will need to replace. If image bad then possible defect with drum.
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You may have blocked print head nozzles. Try the printer maintenance to clear the printer nozzles. After several deep cleaning attempts and there is no improvements in the print then a new print head is required.
The way to identifiy your problem is to send a full colour print to your printer and open the top just as the paper starts to come out . if you then remove your toner / drums for all the colours you can see the transfer belt if the quality of the image that you can see on the transfer belt is good and clear your problem is with the transfer form the tranferbelt to the paper and not any toner /drum issue and the most likley cause is the transfer belt itself "but before you relpace it remove it and clean around the electrical contact points and generally make sure the internals of the printer is free of loose toner .
I'm not an expert on these but I'd guess either the high voltage unit or LED laser PSU are suffering from an intermittent problem. If you're lucky it's just a loose connector - but I'll bet you've already tried re-seating every connector you can find :)