r1.1 was fine until BT updated the modem/DSLAM firmware.
This really only affected ongoing stats, but did also have the effect you have seen of HG612_stats being 'stuck' & consuming a lot of cpu resource. That would also stop snapshot data harvesting.
I will be releasing an update as soon as I get chance to complete the final tweaks.
In the meantime, try the programs in the attached zips.
That should (hopefully) address the issue for you.
You shouldn't need to stop the logging prior to standby/shutdown.