wriggles
Member
Hi,
As the title suggests, I'm with Smarty (Three) on an unlimited plan, which I use tethered for 5G home internet.
I get excellent speeds of around 400 Mbps when I connect but, after a time (maybe 20-30 minutes), the speed drops right down to perhaps 3-5 Mbps and latency increases. If I reconnect by quickly enabling then disabling airplane mode, speeds jump right back to 400 Mbps again, only for the slowdown to repeat itself in another 20 minutes or so.
Can anyone suggest why this keeps happening? Are there particular tests I can run to diagnose what's happening? This is what I have considered so far:
As the title suggests, I'm with Smarty (Three) on an unlimited plan, which I use tethered for 5G home internet.
I get excellent speeds of around 400 Mbps when I connect but, after a time (maybe 20-30 minutes), the speed drops right down to perhaps 3-5 Mbps and latency increases. If I reconnect by quickly enabling then disabling airplane mode, speeds jump right back to 400 Mbps again, only for the slowdown to repeat itself in another 20 minutes or so.
Can anyone suggest why this keeps happening? Are there particular tests I can run to diagnose what's happening? This is what I have considered so far:
- Tethering is allowed, and there is no throttling or data shaping according to Smarty.
- I've checked the cell ID of the mast I am connected to - that stays constant whether speeds are good or bad, so it doesn't look like I'm simply connecting to a slower mast.
- The fact that the connection returns to full speed as soon as I reconnect seems to rule out network congestion, I think.
- I have tried various APN settings - smarty.net, 3internet, 3secure, three.co.uk - the result is the same with each.























