[Garawa]

I have been happily using this for 2 years and took it on holiday where I took a number of long exposures - all silent! I came and charged the battery and performed a clean using a hand blower to ensure any dust was removed. This took about 30 seconds maximum.

Since then I get a quiet rumbling sound on long exposure photos. Each photo still appears to be taken perfectly fine. Anybody know why this may suddenly be doing this after several successful tries before?