Update May, 31, 2017
According to Ricoh service center, it will cost up to 20,000 Yen to fix this issue. To investigate further they need to ship the camera to the factory, disassemble and clean. There is a chance that the lens will require replacement. Now, do I want to pay so much money to fix this, or can I still use the camera ? Need to decide
Did not process my Ricoh GR photos for a while, and what a disappointment to find that the lens was dirty.
I am sure I can fix it with Photoshop, but I don’t like doing it.
Should take care more and check the lens more frequently.