@ VoKaB1 I got your message.
Ok good stuff. When you get a hold of them (your internet) have them go to your house and do a service call. Tell them you need all connectors checked and replaced regardless. Ask them to take away any barrells and to check the cable type you have. You need to have RG-6 cable instead of RG-59, most of your area has RG-59 which is a thinner cable and burns out easily. I know because I worked for Time Warner and Dish Network. Don't let them tell you otherwise, request and demand they do this, otherwise you will keep getting the same problems.
Another question, do you use a router or do you have you 360 hooked up wireless ? Let me know whats going on ok?