hm curious about the issue. Maybe it has an option of selectable file splits in minutes with stopping recording. maybe factory setting around 30 minutes it stopped and just shut down when its gone idle.
Just a thought. I read somewhere here the Yamaha Pocketraks can do same setting and they are very similar to the Sanyos - even which where only sold in Japan, i have a W24 you can set filesplits and it restarts recording (not seamless!) or shuts down via setting.
With 24 Bit / 44 kHZ the recorder hits 2 gig after round 2 h 10 min of recording. so it fits most typical set lengths. if i know the band plays very long i manage to hit and run stop and record between 2 songs or during encore break.
besides that i use the yamaha W24 as backup besides the DR07 old model tascam. will test it out how it does with the Ca9100 on line in later. the yamaha has no variable gain on the line-in but no prob i do that on the preamp.
if it does fine it's the machine for 007'ing, Battery runtime like the M10 very long around 20 hours ...
But the Dr-2d deal is very good - grab it.