Check for dust at the viewfinder‘s sensor and for a misaligned eyepiece. 

I have the same lens and the same problem. Has anyone been able to resolve this problem? Thanks.

Hi, When I go to the menu settings, and browse to the set up section or the network section, the viewfinder switches to OVF and vice versa. It keeps switching depending on the section I am at and it does not make any sense. Why this random behavior ? Is it normal or just on my copy ? Thank you

Hello pw-pix, Thanks for your response, Actually, I mentioned testing on street because you can easily detect it when testing on street. But in fact only testing with small group of peope, even with couple, this issue also happen quite frequently.

Do you have a film simulation in use for jpg? Does it have a Clarity setting? Any clarity setting other than 0 is know to cause processing/write delays when shooting jpg.