On the original DLM, it was possible to specify Fast Path or Auto. Auto defaulted to Fast Path, and the DLM switched to Interleaved if it decided it was needed. It never switched back if circumstances changed.
If Fast Path was specified it didn't switch to Interleaved.
I think it's possible that there are two factors causing your problem.
First, the new DLM (as well as having instant IP Profile changes and a 3dB noise margin setting), is clearly able to revert to Fast Path.
Second, the option in your ISP's portal may be mis-labelled and means "Auto" as above.
How do you get it back to Interleaved, and is there a setting in your router you could use? Possibly via telnet?
My broadband basic info/help site - www.robertos.me.uk
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