Computer message repeatedly right about routine more prone to bugs, nothing less (3-4,5)

'prone to bugs nothing less' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'computer message repeatedly right about routine more' is the wordplay.
I cannot really see how this works, but
'message' could be 'error' (error is a kind of message) and 'error' is located in the answer.
'right' could be 'r' (common abbreviation) and 'r' is found in the answer.
'more' could be 'm' and 'm' is located in the answer.
The remaining letters 'untie' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?