Premove and Timeout question

Hi guys,

Recently, I have played some chess 960 variation games. Things went quite well, except for one minor problem. Particularly, in the game captured below, I remember trying to premove my queen ASAP to checkmate this guy, but it turned out that I finally got defeated by timeout decision even there still had 4 seconds left and my connection was pretty smooth for the whole time. So, I really beg someone to answer me this question: "Was my loss decided by the coincidentally unwanted lagging connection or an invalid queen premoving rule at the endgame of chess 960 that I might not know ?". 

Thanks for reading and considering my problem.

P/s: Here is my game:

Thanks bro

It would have been due to lag or disconnects.