Problem with ","and "."

[CapZap1970]

I like to go to external view using "," and "." to take screenshots, but sometimes when I click on any of those keys, the view goes far, very far and the cam is completely misaligned, sometimes it's pointing to the sky and others to the sea. The arrow keys also act funny when this happens.
When this anomaly happens, it's impossible to use , or . and if I want to take a look I hav eto use F12,but it's a PITA trying to focus it on an aircraft for example, because the view is not locked on the object.

Any ideas what causes this and how can this bwe fixed?
Thank you very much for your help!!!
CapZap