Vigil camera stuttering live feed and on SD card

I have moved the camera 15 feet from my router and inserted a new SD card. It killed my last one. However the camera keeps stuttering. I have to watch for 10 seconds to see 2 sec of footage and then it speeds up in attempt to catch up to current. I have spent hours trying to problem solve this. Can someone assist. The camera used to work great.

I have same problem since purchase 3 years ago. Never got a response so just put up with it! Have now chosen to purchase old established company cameras in next property as they are far cheaper, easier, and cost effective than these now. I can get a four camera system for £199 with all the trimings They have become very cheap. No stuttering with a cabled system. And picture never blurs.