I've found this to happen with these kernel versions:
linux-image-4.15.0-50-generic linux-image-4.15.0-52-generic
Whereas it does NOT happen with linux-image-4.15.0-45-generic
I've found this to happen with these kernel versions:
linux-image- 4.15.0- 50-generic 4.15.0- 52-generic
linux-image-
Whereas it does NOT happen with linux-image- 4.15.0- 45-generic