Just want to share my story.
Since 4-5months ago I noticed there's this weird internet problem with this house that I just rented. Connection was super stable, no slowdown but disconnect once in a day, Thinking it was a temporary problem I let it goes on for a month, afterward I beh tahan because I need stable connection to do works and play my games, makes report about the random daily disconnection, first tech made a visit, figures nothing wrong and left after cleaning the RJ11 port.
Next few days problem still persist, made another report, same tech came, still can't figure out what's wrong since everything was fine (regular SNR Margin/speedtest check). Problem still there after he left, because of my busy schedule, I made another report a week late. This time a new tech came, he looks more experienced than the last one, also can't figure out what is wrong, decides to change the default modem we're using and told us to wait 1-2 days before making another report if problem came back, but I did not because trimester break, no one was home.
So the new trimester (2nd months) starts, proceed to made another report since I still got the problem, again the 2nd tech can't figure out what's wrong, this time he decides to remove the RJ11 port, made a direct connection to router. (He did ask why we didn't give any feedback after 1-2 days since last visit, we told him why, and he nodded). Again, problem still there, he still can't figure out whats wrong because it doesnt happen when they're around (because random, that's why) and wrote us a service request form to us to send to the apartment management office, this is the part where it takes like 2 weeks to solve (mostly waiting) because apartment didn't have any permanent sysadmin in house. After 2 weeks, the apartment tech finally came, pokes around, also figures nothing wrong with their networking equipments (I waited longer because apartment did not tell me about it, he visited when no one was around).
So 3rd months, I made a final report stating properly to the CS about my situation, acknowledged of my situation, report was made. The 2nd tech called me after few hours after I made a report stating that my internet will be cut off for 2-3hours to replace a part in their DSLAM and splice a new cable to my unit. Few hours after that last call, tech called me to tell that my internet back on and asks me to do a speedtest, made a self speedtest, acknowledged them everything looks fine (speedtest/snr margin), they left and told me to call him directly if the problem still persist. No more random DCs since then, pretty happy at the moment. Doesn't ends here though, I'm going to ask for bill rebates for 4 months (date of first report made), hopefully everything went smooth and I get my well deserved rebate.
Thanks for reading,
TL;DR : Don't give up, its your right to have stable connection