Is this only happening once you hit the monthly cap, or at any time?

I really don't see why any ISPs need to impose data limits on broadband these days. Just proves some are trying to run their business on the cheap by running limited lines at each exchange, then over subscribing them and throttling everyone to attempt to manage the limited physical data bandwidth they have available.

It doesn't matter how fast you're connection reported from your house to the exchange, if the connection from the exchange to the isp is worse.

What ISP are you with and how much are you paying? You can get unlimited broadband for under 6 a month these days.

I must admit though that the difference since switching from adsl to fibre is amazing. My ADSL was unlimited and about 6mbps, but suffered connection stutter and download issues sometimes, common with most ADSL connections. But with bt infinity I've not really had any of these issues and it's really smooth using it. Downloads have in fact been getting faster, with Usenet yesterday achieving over 80mbps!, meaning over 10MB/s. That is amazing.

Anyway, back to your issue. I don't think I could put up with even 150kbps download speed. That's really show in this day and age. Only just faster than dial-up. You really could do much better with another isp.

The other main issues causing bad data packet loss could be noise on the line. Have you tried a quiet line test? Or a faulty router. I've had so many issues over the years with bad routers. If they start playing up they can start syncing at really low speeds, and a reboot with often see then up back up to the true line's bandwidth until the router warns up, then it starts to drop again.

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