DAS stopped but apprentice has returned

I think rather than restart on DAS it would be simplest to ask DAS to remove the Stop applied in error.  Keep reporting on the ILR as studying - this may throw up a DLOCK error until the Stop on DAS is removed  but is the cleanest route.  

Thank you Martin, how do I contact DAS to get them to remove the stop?

We've had this happen to us quite a few times in the past (as the DAS can be really unintituive for the employers to use). The exact guidance changes every now and again. But if you login to the DAS and start a conversation with the chatbot, put your question to it, it won't give you the right answer but it then lets you chat with a person, who will instruct you in the process. Last time it happened they instructed us of the below:

A stop is not reversable on the DAS, the employer can back date the stop date to the start date, which lets you start a new Apprenticeship record on the DAS which will still be live. If you do this and it hasn't resolved by the next return it will clawback any payments made this acadmeic year. 

Sam's solution above is the same way we have resolved these when a record has been stopped in error, ask the employer to amend the stop date to match the start date on the stopped record, then add a new record (using the original start date, etc.) to replace the stopped record.

Note this applies for levy paying employers, but I would seek further advise from the helpdesk if you are working with a non-levy paying employer, as you won't be able to backdate the new record where funding reservations are involved.

Chris Bennett makes a good point, I read your issue as the learner had now been stopped in error as the learner didn't leave employment and has uninterrupted training. If that's not the case then it gets treated slightly differently.