Yes, I understand that there were no disconnects during that time. The question is what was happening and not what wasn't. When you look at the miner's window you see a lot of stuff happening: shares being accepted, new work received / blocks announced, your hashrate reported etc. If you have your log settings (in xmr-stak it's called verbose_level, not sure how claymore calls it) set to the highest level of detail, all this information should be logged, just like the miner outputs it in the main window. I don't know what kind of verbosity you've set since you didn't mention it, and I didn't see your logs either. If you want to find out what happened within those periods of time when you see the dips to 0 on the graphs — you need to "find" them in the logs and see what was going on. Maybe your rig was switching to the dev pool, and then for some reason can't reconnect to the main pool quick enough.. I don't know, the answer should be in the logs. If they're not detailed enough then adjust log settings and repeat the experiment.
Which were 10% "smaller" shares. Nothing unusual here.