Due to my experience, loading a phone with 1A during operation is too low. I almost killed my phone last year, because it became hot and the sun in addition made the phone (luckily!) shut down.
After switching to a 2.1A loading device, this problem vanished.
I also have read reports in the net that describe this problem as a common issue.
I don’t believe that this is a problem specially triggered by Kurviger.
Yours
Michael