I can say without a shadow of doubt that this is caused by the ingress of liquid into the
mod and onto the circuit board.
My friend bought one of these, and me, being a vaper of many years, was interested in this new pod design.
When I tried his I was very impressed with how good it was, and after confirming that the battery would last a whole day I decided to order a couple from China and pack away the joytech I had been using for the last couple of years.
But within 2 weeks my friend reported this same issue, the resetting to 5, turning off by itself, not being able to restart, ect ect.
Thought he had bought a dud untill I received mine. Within 2 weeks the same started to happened to one of mine.
I had noticed there was small amount of
juice in cavity between fills, no more than on most mods.
Almost like condensation build up.
I figured it might be leaking into the
mod where the plate the pod sits on meets the body of the mod.
I decided to use some silicon sealant smoothed around the edge of this plate and also around the 2 gold pins to see if this would stop any ingress.
Since then (nearly 3 months) I have had no further issue.
The mod that had started to show a fault is working fine...No more issue.
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It is poor implementation of a good design by Vaperesso.
Edit:
It would seem that other pod mods from other manufactures suffer the same problem.
I would say that it is an inherent problem with the design of pod mods.
The cavity that is left between the pod and body of the mod allows warm vapor to sit, where it condenses back to liquid when it meets the cold surface of the mod. Eventually it 'pools up' over time, and leaks into the mod if not sealed properly.