Game glitches out randomly during important fights

I have no idea what could be the cause, but whenever I end up facing 1 to 5 enemies (EX : I run into them at level 1, they tower dive me, or an important fight starts) for some reason sometimes my game just lags out for 2-3 secs and then the only thing that I know is that I died without being able to do anything. This is getting pretty stupid, especially when I got to hold my base against several people and that just happens. Ends up getting bashed on for something I have no control on. Using Bell Fiber here (I'm located in Quebec, Canada).

Is anyone experimenting the same thing?