internet keeps dropping intermittently

Hello,

I started by KPN subscription on 21 October 2022 at Broerenstraat Arnhem. 

Initially, my internet was working perfectly. After approximately 1 month, my internet started dropping and returning intermittently. I tried all solutions I could find in other forum posts (reset the modem, hard reset the modem, switch off the modem for a while, etc.) but the problem continues to persist. 

I was out on holiday for a month so believing that the problem was temporary, I did not raise a complaint. I returned yesterday only to find that the problem persists. 

Could someone help and point out what would be the right way to go about correcting this?

Thanks!

Smarjeet