You either have a failing wifi module in the bird, failing RE700 or poor antenna connections.
The wifi module has been the source of issues since the P2V+ was released. Your brief example is a familiar symptom for that unit failing. The issue is associated with an over heating of the module. The over heating is typically caused by an extended power on condition without air flow through the bird, i.e. sitting on a desk.
Plenty of threads here in the P2V+ forum to trouble shoot your issue with plenty of advice to resolve.