So suddenly in the middle of something your computer can't browse anything and web browser? Seem like there is no internet but wifi/LAN connection is available and connected? If the condition is the same as i said before, then you should try this simple step. This step is know as flushing the DNS IP cache which is the process of removing/refreshing existing old, expired, or consumed the allocated cache memory for the IP address. Flushing the DNS cache will make sure the allocation of new DNS IP cache can be done.
