With Three UK, I have not 1 bar but 5 bars!

Until about March this year, it was excellent and I used it as my home broadband. 60MB/s down, 20MB/s up on a good day. Much better than any ADSL I'm able to get.

Since March, from about 10:30am until 5pm some days, and late evening other days, there is no working data, and occasionally no working voice, despite the 5 bars.

It's working fine until then, and then it just stops completely, fading over the course of maybe 10 minutes. This happens all 7 days of the week.

The working theory is congestion at the base station. That's consistent with the occasional 6 minute ping times that I've measured, and more usual 20-30 second ping times, when anything gets through at all.

Still shows 5 bars. Three's coverage map says it's good here. Just can't use it.