ricochet
Rocket Captain
Seems like this problem happens to newer bikes as well as the older models. Is it because the 1-2 shift puts the most pressure on second gear, whereas the 2-3 shift 3-4 and 4-5 shifts are less harsh on the transmission due to it already having lots of rolling speed. I think I read in the Suzuki m109 forum that they have some of that same issue.
It's true, one of the most common issues with the M109R's is that the second gear keeps popping out when giving it hard gas. A lot of people have this problem with PRE 2008 models. I personally had a 2008 for 5 years and never ran into the problem, but its true that shifting from 1 to 2 is quite clunky. One of the repairs you can do was to rework the teeth so that they point back or something which fixes the problem but costs a few thousand bucks to fix.
Sorry to hear about your issue, but I know how you would feel if you can't have a reliable ride. I hope your issues gets resolved!