Failing to extrude after switching material mid print

[PDPrinter 0]

Hello All

I have an Ultimaker 2 Extended +, and pretty much all is well except two things as below. Any help would be much appreciated thanks.

1. In the past I have successfully switched colour (BOTH PLA) during a print having added a pause at height plug in. However the last 5 or so times I attempted this the machine extruded through the new material until I selected that it was coming through, and then when I started the print again it failed to extrude every time! this has wasted a fair bit of material time :/

2. Not such a major issue but still annoying, I have to manually set the extruder to 210 before every print even know the UM knows that I am using PLA and says 210 when I put the filament in, it just seems to be set at room temp for every print.

Thank you in advance for any help.