drop in views

Hello everyone, My channel was doing better and better - until shortly. It was nothing compared by others here (90-120 views a day) but my peargroup is small. Most people found my videos by recommend from youtube or browsing. Lately there is a huge drop in recommendings from youtube. Views are...

3 of my 7 channels are seeing a 50-80% drop in views from the 17th to the 18th. Upon looking at my traffic sources from before the change to after the change, I notice that my most popular videos on those channels have all but vanished from the suggested video sections of other videos. Ouch...