I have an Airtel Broadband connection and I'm encountering a problem with the modem. The modems keeps restarting randomly while browsing. It works fine for a few minutes and then I suddenly get a balloon notification in the system tray saying "A network cable has been unplugged". After this notification shows up, all the lights of the modem except the "Power" one turn off and I have to turn the modem off and turn it on again. Sometimes it works, or I have to wait for a few more minutes and keep turning it on and off again till it works properly.I've noticed that the frequency of this problem is more AFTER I've exceeded my Data Limit of 8GB and keep getting redirected to the Airtel SmartBytes page or when the bill cycle is nearing it's end. The modem works fine when a new bill cycle and starts happening after a few days from the start. So I called the Airtel helpline and they said they would send over a technician and I got a complaint number. The technician showed up the next day and waited for an hour at my house. For this one hour, the modem was working perfectly so he said that there is nothing wrong and he closed the complaint. The moment he closed the complaint, I got a notification on my mobilethat the complaint was closed. I turned on my PC for browsing later that day and the modem gave me the same problem again.So I called Airtel again and told them to send over a technician again and they gave me a new complaint number and said that a technician would arrive the next day. After they gave me the complaint number the modem started working properly again and the technician said there was nothing wrong with it and closed the complaint.(WTF?????)As before, the moment the complaint was closed, the problem started again. This can't be a coincidence.So basically I want to know why is it that every time I call a technician, the modem starts working properly by itself and the moment the complaint is closed, the modem keeps giving me problems?PS:I had an Airtel connection 2 years ago and had the Beetel 110TC1 model at that time. I changed over to Tata Photon Plus but I wasn't happy with the service and switched back to Airtel about 5 months back. They offered me a new modem but I told them that I had the old modem and I don't need a new one. Is the problem because the modem is too old? Please advice me.