HP3830 keeps misfeeding

[thadcl22]

My HP Officejet keeps misfeeding when printing multiple consecutive pages.

I used to print 20 pages at a time on 2-sided settings.  I do this because occasionally, it would

a) not pick up the next sheet thus causing a 'jam' message then cancelling the rest of the pages.

b) take the next page with the current one printing thus out of sync pages.

 This is frustrating because I had to reprint the missing pages one at a time. a 20 page set wouldn't be too much trouble to recover from manually but I have lost trust with it ability to print consecutively.

Just a few weeks ago, the printer keeps jamming more often as well as failing to pick the the current page.  It also, prints a page fully but is still inside and not fully out. In this situation, it pulls the page backwards a bit then spits it out fully rather than fully pushing it out in one smooth motion.