Boost Restriction after first gear pull

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Hello people,

New to this forum and need some expect Subaru advice.

I am driving a stock 2018 Subaru impreza wrx sti with just over 4000km on it.

When i first ran the car in it was always touching about 17psi and felt like it had great power.

However I did a first gear pull one night and ever since then it only reaches 8-9psi.

I brought it back to the dealership and they said that it's fine and it's just the cold weather but its heated up since then. For weeks I tried to figure it out and a couple nights ago I plugged out my battery for 10 minutes reset the whole car and when I plugged it back in the car was back to full power.

After i do a first gear pull it restricts be back to 9psi (thereabouts) and I have to plug the battery out again to reset it.

Has anyone any insight to what this is or what's happening?

Thanks in advance and cheers for helping
 

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