Transmission problems 2004 C320 wagon

[Clarion]

Just bought one cheap...owner said the transmission was quirky. What research I've done, there seems to be an issue with the transmissions in the C320 4matic. I read they are 'user friendly' meaning they adjust to your driving style over time. It drives fine most of the time but I'm surprised intermittently by Skipping gears and lugging. I also get the 'limp mode'. Is this car a lemon?