I've checked the connection and can see no problems currently. However, the connection has timed out 500+ times in the last 6 days. These may have occurred at the time of your post as the modem has now been online for over 6 days continuously without being rebooted. Can you confirm if you are still experiencing issues?
I have just checked your connection and network segment. Although the upstream power is a little on the high side it is still within tolerance, and there do not appear to have been any network problems recently. If you are still experiencing difficulties then please re-post with the information described here taken at the time, together with traceroutes to bbc.co.uk (no WWW) and any other sites which are causing you problems.
We have seen Kaspersky and Avast! interfering with speeds so, if you are using either, please disable it when speed testing. Please also check that the power supply is 12Vac, 1.5A. A CAT 6 ethernet cable is also recommended.
If you are using speedtest.net to check your speeds then I suggest that you use the Paris server option as it is reputed to be more accurate/reliable than some of the other servers. You may also find that less heavily loaded sites (e.g. speedtest.magnet.ie or top10.com) give more accurate/reliable results. Speedtests should always be run from a single, ethernet connected PC, with no devices connected wirelessly.
Concurrently downloading multiple large files from multiple servers and adding the throughput will usually give a more accurate indication of actual download speeds than speed testing sites.
If you are new to the forum, please remember to search the forum before posting your question. Please don't send private messages directly to the forum team unless they ask you to, post your issue to the forum first.