Ya never know, I've been driving stick shifts for 40 years back to 70s Ford trucks, air cooled VWs and cable-actuated 80s Hondas, the FJ40 for a while to modern stuff and motocycles through today. Sometimes you just don't hit the engagement smooth or kill it from a red. Just happens.
It's only irritating when you have to stop juggling the MP3 thumbstick, Big Gulp and radio mic to restart the engine.
Honestly, I bet since I think you mentioned something about only at first it's just cold friction material on cold surfaces. It could be glazed, in fact there is likely some glazing, they all do a little. Sometimes you ride it longer than you should off road or towing or pulling a car in the snow. The pressure plate fingers and springs fatigue, bearings start to wobble.
Yeah, it's probably getting to needing a clutch, but everything falls on a scale of urgency and it doesn't sound highly urgent yet. If you try to start in 5th gear does it die immediately or slip for a second?