Internet speed slowed down after a few days using Teltonika RUTX50

Hello all. I’m facing a strange issue and I could appreciate your expertise and knowledge. I’ve recently purchased a Teltonika RUTX50 which I’ve setup on my rooftop using an antenna enclosure for outside usage. At the beginning the speed was about 400mbps down and about 90mbps up. After some days (maybe about a month) the speed has dropped to 90 down and 85 up on average. I’ve updated to the latest firmware and rebooted the router a few times (along with the entire infrastructure I have here) so far the issue persists. Is there anything I can check before blaming the ISP ?

Thank you in advance

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