A/C short cycling

Dometic 13,500 a/c and thermostat. 2nd owner so no warranty.

Unit powers up, blows a minute or so, then shuts down for a few seconds. It then powers up again and cools properly. Sometimes does this 2 or 3 times before settling in. Is this normal? If not is the problem in the thermostat or a/c unit?

Thanks!