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Precision 7540 really slow upload speed but normal download on wireless

Hi, I'm having a weird case. I got a brand new Precision 7540 and it goes as fast as I thought but I noticed that on wireless internet upload speed is barely 300Kbps, I got a symetric connection 300/300 Mbps, download speed is normal (around 200 Mbps). I got several other devices, and have tested on them and I got similar results for upload/download speed so modem/router are not the problem. This behaviour occurs even when tranfering files in the local network.

I have tried updating drivers, change network configuration, run diagnostics checks and found nothing that helps. Have anyone saw this behavior before?

Thanks in advance for the help!

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