Since receiving my A7 IV just over a month ago I have been experiencing weird and random locking up/Freezing issues.

Whilst focusing the camera will just stop doing anything, to the point that I have to remove the battery in order for it to reset itself, also I have found when turning the camera off that it doesn't actually switch off but remains on no matter if the switch is in the off or on position. 

Lens used are Tokina 85mm 1.8 and Tamron 70-180 2.8

Any advice would be a appreciated as this is my first experience in the mirrorless market