Problems when feeding 310gsm, A3 and A4 Fine Art paper through the FRONT FEED TRAY, especially A4. The paper will feed through but an error message kept showing up re' "paper skew" which prevented printing.
This is how I solved the problem :
On the printer control panel click on the settings (the spanner)
System admin'
Printer settings
Then click "paper skew off".
This worked on my P600 and I'm now able to use the front feed tray with 310gsm paper. I should say there is no problem with Epson paper or other branded, thinner paper. I only had it with 310gsm Fine Art paper.
The above is simply a suggestion, you may not have this problem at all - it's simply what worked for me.