I know many have had good luck with the P900, I wasn't so lucky...
The first purchased new worked great with matte paper but would never feed luster properly, always needing help. When I wanted to print with Exhibition Fiber, that was the end of the paper feed and it was replaced under warranty.
Things worked out better with the 2nd printer. But after nearly a year, it first started to spit ink on the borders before grabbing three sheets of Exhibition Fiber and becoming a brick. It was out of waranty and beyond repair.
I found a used 3880 which had the ink valve problem for very little. I had my printer guru rebuild it and it's been going strong for two years.
Last year, I hedged my bet and bought a pair of P800 printers, pretty much just updated 3880s and I couldn't be happier!
All three can sit for weeks unused and usually the nozzle check is fine when I start using them again.
Had the 5370 been available, I may have bought that in the first place and saved myself grief and have "only" one printer sitting on my desktop today.
There may be a way to "fix" your paper feed in your P900 by roughing-up the feed rollers but if it starts randomly flinging ink or it attempts to pull several sheets into the feeder, it may be on its last legs.
I wanted this printer to work well so I could print both matte and photo papers but ended up with dedicating one printer to each of my P800s which works just fine.