As the programmers very very probably did not intend it to be like that

it looks to me as if the difficulty adjustment algo is getting gamed somehow. Different from, but comparable to an instamine. It happens regularly.
Commonly known exploit/attack/bug/whatever-you-want-to-call-it of KGW. Most other coins that use KGW have patched/fixed. Think I mentioned this before sometime earlier in this thread. Have lived through it on other coins...search the forums for description/fix.
Hint: look for Heartbleed and TimeWarp vulnerabilities.
One possible solution is to add the digishield diff retarget:
https://github.com/casinocoin/casinocoin/commit/1f0b80e20aa13b8aa9146b61344131c5d555c709Hehehe, ok more than a hint
