hi guys, mustered up the courage and did a hard reset (factory restore) and it appears to have fixed the battery drain, also some of the niggly bugs seem to have gone to. I assign separate ringtones for both calls & txts (really like this option) for each of my contacts, rather than use a single ringtone for all, and this seems to work, though I did notice a soft reset reset the ringtone back to its default. Also noticed the ascent colour had reverted to blue, instead of the silver one I prefer. Had a few issues with the store not able to display my apps history, so used the store website in IE11 to open my account and view my purchase history. I then re-installed them one by one (I did do a backup to onedrive before the reset and the backups appeared to be saved, but after the reset there are no backups saved on onedrive...strange?)
All in all it was definitely worth doing the hard reset, phone seems snappier, apps work better & seem to be integrating with the OS better. Lets hope Samsung release the firmware soon so we can use our cameras and flash's again, not to mention being able to use a ringtone of our choice.