Help with connection stability

Hi , i'm DMing a game with 6 players , but after 2 hours of game , my connection start to crash , i check my line and it's ok, everyone in my house has a stable connection and is just Roll20 the one that disconnect . Do you have any tip to get a more stable connection. ?? In the game we are 6 players , we use music from soundcloud and like 10 pages with a lot of pictures  Do i need a better PC to play , at the moment i am using a basic laptop to play but i can change to a high end gaming pc , that will work ?? if i buy a subscription , my connection to roll20 will be more stable ?? thx in advance 

In a 4 hour session I usually have to reload at least once because things start to get laggy. Sometimes I just need to logout and log back in, but other times I need to close the browser all together. It just seems to happen sometimes.