Unable to establish connection

I need help before I throw my laptop out the window... sometimes when I try to log into blackboard on my uni website it comes up with unloaded screen saying, 'can't connect to server'. I've turned my proxy off, even my firewall for a split second and it still didn't help. Sometimes if i restart my laptop it starts to work again but then at random times it just decides I can't use it, which is super frustrating for trying to study! Help?