Your bRAS profile is likely to continue altering dependent on the conditions of your line at any given time.
The best way to minimise this would be to remove any uneccessary devices from your phone line, avoid the use of any extension cabling and if possible try connecting your ADSL equipment to the master socket. You should also double check all filtering. This way you should be able to push the most out of your line.
Your line attenuation is outside of limits for a 2Mbps connection so although you had the service previously there is a slim chance that an attempt to reprovision you on the fixed rate product might get rejected by BT.
Bob Pullen Plusnet Products Team If I've been helpful then please give thanks ⤵