I'm using an EE 4G mobile broadband SIM in a dlink DWR921 router at home with an external antenna and generally getting a speed of 20 mbit/s down and up according to speedtest.net. For some reason a few times every day I get a period generally from 30 seconds to 3 minutes where web pages fail to load giving a timeout error. During this time I can still ping successfully and even download a large file by ftp so the connection is still working, it's just the http / https protocol that seems to be having problems. Also during these times my phone with an EE SIM in it doesn't seem to have any problems loading web pages.
Can anyone suggest what the cause of the problem might be? Something with my equipment or a problem with EE?