This was on PC(Steam)

I was playing in Standard ranked against a mono red player. It was turn 7 or 8 and i cast Season of Weaving. My opponent had nothing in hand and 2 monestary swiftspears and a heartfire mouse. Before the spell got to the point of letting me pick the modes, the screen dimmed and connacting server ppopped up on the screen. After a minute i was able to click on things again but was not able to choose the modes for my spell and apparently it had gone on to their turn, even though they had not drawn a card. they attacked and hit me all while it was still looking to me like i was casting my spell. It then cycled to my turn apparently and my spell immediately cast and i was able to pick the modes and it went on the stack. After it resolved i was no longer able to click on anything in the match and i timed out. This is very upsetting and frustrating, and i hope it is not something that was done on purpose.