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From the Internationallawoffice:
Article 56 of the Decree on Admittance, Residence and Employment states that a short-term work permit can be renewed only after a 12-month interruption or cooling-off period. This means that a person who has left and been de-registered from Switzerland must wait 12 months outside Switzerland before being able to obtain a new work permit.
Exceptions are possible in reasonable individual cases, especially in case of recurring activities.
This means you will have to wait 12 months from the time of exit in order to apply for a new permit.
If you have to travel more often than a year, you can state this in your application stating you have regular repeating work.