Time Outs

[#1]

Download speed has been fine recently, but over the last few days I'm finding that if a site is slow to load, or  times out ,then my internet connection is dropped. The wireless link to router is fine and only by rebooting router can I reconnect to the internet, if this is a common problem can someone suggest a solution?

[#2]

which router
To be clear is it dropping the connection to the exchange or to the internet - can you post the relevant part of the router log

[#3]

Thank you Oldjim. Trying to attach a log now.