HP printer trouble

Hi,
I have an HP Color LaserJet CP1515n printer since 2008-09.
It has printed a total of 6339, according to itself. Not many pages for a laser, but for all these years it simply printed when I wanted it. No more ink trouble. I'm happy, it was a good purchase. 262€ at the time.
Coincidentally, the printer warns that the toner has run out. It does this from the page count, so it may be able to print a few hundred pages more before I notice printouts are going bad.
But today it claimed to have a paper jam. I opened the paper drawer, the back panel, the toner drawer. No paper jam at all. I closed it again, the printer tried again, and after two tries it continued printing happily.
Then I printed the second batch (the reverse side of an instruction book, first the odd pages, then the even pages, because this printer doesn't do two sides), and after 50 pages, 10 pages from the end, it claimed there was a jam. I repeated the procedure, no go. The noises it made seem like it is unable to grab the paper from the tray. So I powered it down, then up, and in the computer I repeated the print job for the 10 remaining pages, but changed the tray to number 1, which is the manual intake, 1 page at a time, and I could finish the job.
What do you think it is going on?
Maybe the paper (110 grams/m², explorer from www.explorer-paper.com) is not to its liking? It did not complain before. Try another paper. I just did that (80 gr/m² plain supermarket paper) and it worked perfectly, printed a sample print page silently. I don't have anything longer to print now.
Some roller broke down, rubber too old?
At the price of a printer, a repair is not worth it. Maybe time to buy another one.
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Cheers, Carlos.