Being a very long time player, I've built up my realm to the point where (even with a 'clean' board) I have a LOT of stuff out. While energy isn't an issue for me, I don't have a ton of free time at work. Collecting from chosen items can take ages so I pretty much used QC constantly in those times when I can check in just to get as much done as possible, as fast as possible.
Over the last week, though, I've been off work and since there's no rush I've not been using QC. At the start of this current event I noticed that my rollbacks seemed to happen most frequently after I'd use QC.
For example, I'd tap all my expansion items, QC to collect all the drops before moving on to tap a few items without doing QC. Sure enough, I'd only ever get a few taps in after a QC before a roll back would hit.
Not sure if I was seeing something where there was nothing, I decided to test it out. If I chop 5 Coffee Grinders (100 hits) and wait out each hit, no rollbacks but if I chop TWO Coffee Grinder (40 hits) and used the QC then I'd get a rollback a few moves later. The rollbacks didn't show after every single QC but honestly, one would show up 4 out of 5 times I used QC.
At this point it occurred to me that this might explain why I'm plagued by rollbacks constantly when using the timed free energy. Because I want to get as much bang for my buck, I chop a bunch of items then use QC which triggers the rollbacks.
Rollbacks were so bad during free energy sessions that I've stopped using them. I've got a dozen of them waiting in my goal book but refuse to use them because I didn't want to deal with the nonstop rollbacks.
With my new hypothesis in mind I decided to participate in the WW at the start of the Coffee Grind event. I made sure I didn't QC intentionally (I do it accidentally on the rare times I drag instead of tap, lol)and I didn't get a single rollback which was what really made me believe QCs and rollbacks are linked.
It makes a sort of sense, if you think about it. Rollbacks are basically the servers not saving our progress properly so forcing the game to register a hundred taps in a single moment seems like a great way to cause these hiccups.
I've practically been conditioned by my impatience to use QC for darn near everything in my game. It's made it difficult to stop completely but I hope after a few weeks the low and slow method will become my new normal. :D