u/Hunchox13

So I bought this accord about 6 months ago, it does have around 250k and was driving fine until recently. It goes in to limp mode randomly, usually the end of my day, I drive around for work so I drive about 60 miles a day sometimes up to 90 miles. It goes into limp mode and loses power and doesn’t shift up or let me exceed 40mph. Two codes do pop up P0780, P1899 I can usually limp it home and leave it parked over night and by the next morning it’s driving fine again till about 4pm and acts up again. From my research it may be a transmission solenoid, anyone else have any idea what this might be?