Has anyone had this happen to them?

Yesterday morning, I was working on a EA, when all of a sudden, the trade that was opened, had a TP, when one wasn't entered. I thought that maybe I had accidently entered one when I was working on the EA. So I deleted it. Later, in the afternoon, I was working on a modified version of the EA I had been working on, in the morning, I had renamed it, so that I can go back to the earlier version if the later version doesn't work out. The EA had opened a buy order and a short time after, I noticed a sell limit order was placed at a price above my buy order and with a lot size 5 times the size of the lot size of the buy. What struck me, was the lot size of the limit order was the lot size, of the earlier EA, that I was working on. I went to Meta-trader's log folder and found that at each incident, connection was lost, ( though I didn't notice. ) a ping came to my computer from external source and then the event occurred. First modifying my first order then same events in the afternoon when the limit order was opened. I opened the Log file in the MQL folder and there was no record of either events. After checking out the log files, I tried to shut down Meta-trader and had a difficult time. When I shut my computer down, it wouldn't shut down until background programs that were running were forced to shut down. It seemed as though someone else was in my computer. I am using a demo account, to work on the EA, that I set up directly through Meta-trader's site, years ago. I've noticed that the demo-server is through a broker that I have a live account with, now. Just wanted to know if anyone has had situations like this happen to them before.