'04 TSX 6 speed MT w/ 110,200 miles starting to develop problems occasionally when shifting into reverse. Sometimes the gears grind going into reverse, other times no problem - shifts smoothly into reverse. On one occasion parking put the gearshift into 1st, turned off the engine, and upon starting up again in neutral, shifted into reverse, and the car would not move. The shifter "locked" in reverse, and couldn't shift into any other gear. Turned off car, let it sit for a couple minutes, turned engine back on and the shifter unlocked, allowing to clutch to engage into 1st. Appreciate any thoughts re: this problem. Thank you in advance.