Crashing

Whenever I attempt to log on into certain servers, usually affecting all of them but some are more sensitive than others, I tend to crash. I don't simply just crash, but I get sent to my minecraft launcher repeatedly. On average I crash 3-4 times before I can access the server and often I crash while on the server, having to go through the tedious process of crashing and returning. The issue may be my laptop, but I have done almost everything in my power to reduce the chances such as repairing my MC launcher and whatnot.