I have read some items discussing hths but none like my problem. It occurrs after freeway driving or (I am guessing on this second one) after the vehicle gets to operating temperature, however it does not happen around town. The transmission shifts with a "clunk" and them is stuck in low gear. I stop and then shift again and sometimes it works immediately, but sometimes I have to do this several times. Eventually, its shifts from P to D smooth and then all is well. I never does it when first starting out during the day. Any ideas?