After much seraching, I could not find a specific thread for the Roland R-05 recorder (feel free to correct me though), so I'll start one.
I have been using my R-05 since 2011 and think it's a great little recorder and certainly more sturdy than the R-09 it replaced. However, mine has developed a strange fault. It likes switching itself on and off, intermittently. Sometimes a press of a front panel button will start it up, sometimes it just won't stay off and needs the batteries to be removed. It works fine otherwise and hasn't switched off when the lock is on. Has anyone else come across this strange behaviour? FYI - my unit hasn't been dropped and is well looked after. Firmware is the latest 1.03.
I have been in touch with Roland UK, who did a little troubleshooting by e-mail and have now arranged for the recorder to be picked up by courier, for their engineers to have a look at it. Though it is over two years old, they tell me it is still within the warranty period, which is nice. I'll post any rectification and fault details when I get them.