We're new to Sky Broadband, the switch was painless and after the first day we had a pretty reliable connection at the same old speeds we had before. However it's become clear that sometimes our download speeds drop to the floor, and I've realised it consistently only ever happens when we're uploading any data. Basically, as soon as I am backing up files to dropbox, or uploading some songs to my Google Music library, then downloads and even basic internet browsing comes crawling almost to a standstill. This is not normal of course, and I've never experienced this before. Sure, when uploading there will be a small hit on download speeds, that makes sense, but this is just crazy. We're about 7 days in to that initial 10 day testing period so I'm hoping this is just part of that initial phase and that it normalises soon. Can anyone shed any light on this, is it a regular occurence, or is something abnormal happening here? For some further evidence, I did a SpeedTest.net test which showed the usual, ping around 50ms, download around 4-5Mbs. Then I fired up the Dropbox app on my phone which continued uploading some photos, and I tried another Speed Test. Ping was 540ms!!!??? Download speed jumped to 4 then quickly went down and down and down to less than 1Mbps. Properly quit the Dropbox app on my  phone so it would stop downloading, did another test, and back to what it should be. Very odd.