garage door openers problems

any buddy here good with garage door openers, have chamberlain 3/4 unit will open fine but now will not close from the remote { wife very unhappy !!}, I have made sure there is nothing blocking the sensors have readjusted the downward force adjustment, no help, I must use the wall push button to close it, even when you use it the door moves very little stops goes back up lites flash on and off a few times then you push the button and must hold it till the door is all the way closed , any ideas what to try next ? production date show 6/11 !! thanks for any help !!