Line is good but no internet

[TheDarylSharp]

Have a legacy gfast connection which has been rock solid for years. 
attempting to transfer to a new ee line but openreach are having software issues.

At the same time my gfast router has apparently failed flashes then goes solid yellow. Got a replacement router but it’s doing exactly the same thing. 

openreach have been out and can’t find a line fault and EE can’t find a line fault.

i suspect whatever openreach are doing in the background has caused a hidden fault.

anyone got any ideas thoughts for my next Openreach engineer visit on Monday

[JimM11]

@TheDarylSharp What is the attempting to transfer to a new line with EE? G,Fast although still remaining in some areas is not an easy transition to new.

[XRaySpeX]

What BB are you attempting to transfer to, Full Fibre (FTTP) or partial Fibre (FTTC)? It won't be G.Fast as EE no longer sells new G.Fast lines.

I presume your current router is the white EE Smart Router.