Change in IP profile?

I have had Infinity now for the last two weeks - over the ten day period.

I have been connected at the 73.5mbits IP profile all that time until yesterday when for whatever reason the modem dropped the connection and it reconnected at a 69.5 (or thereabouts) IP profile.

I have no idea what caused that but I would like to have the full profile back and not be limited - it was not as if I was having lots of drop outs so I don't know why it changed.

Can I get it changed back?

The profile might decrease if the line isn't stable. You'll need to give it a few weeks to increase by itself.