I have a couple of related issues.
When I pause syncing with Lightroom Mobile it doesn't actually stop, even though it says it has. If I check in task manager Lightroom is still uploading. The only way to sort this is to pause sync, then restart Lightroom.
Additionally, and more problematic. If I select a collection to sync then change my mind it seems to continue to sync all the items anyway before 'un-syncing'. Recently I accidently selected a folder with 650 images to sync but even though I unchecked it again it continued to sync all 650 items! I live in a rural area with less than 1MB upload speed - it took ages and the internet was unusable during this time! I tried deleting the collection online, this didn't help either.
If someone knows a way round this then please let me know!