Problem with the client(brings me back to the laptops wallpaper everytime)

Hi my dudes! I have this problem since yesterday, and it has never happened to me before. Everytime I go in for a rank game, between min 1:30-3:00 the game backs me to the laptop, as if it had an announcement or something (it makes that windows noise). Since this is pretty bad, because it breaks my lane phasing, usually getting me killed, I'd like to have it solved. Does any of you guys have any idea about what could be wrong and how to fix it? Thank you! Btw, I already tried to relog the client and turned on and off the laptop.