Severe Stability Issues!

Ok, so as with many iv seen, we had out ATT Internet switched to U-verse around 6 months ago. We are avid movie streamers as well as gamers. This makes stability a big thing for satisfaction. Anyhow, since we switched, we have had connection issue extremely often. The service light will go red, and recently the broadband light went red. Iv read up some stuff about many peoples connection stability getting worse at night, which seems to play a factor in out problems as well. Iv called AT&T about this problem around 3 times and had a tech come and check it about 3 times. Awesome guy, but it seems that nothing can be done to resolve the issue... We have tried switching out the modem for a new one like 3 times to no avail. Everything wired in the house looks good from what the tech said... I don't think anything is interfering with the line on the inside either. I had heard it mentioned by the tech that possibly switching to a lower package, (from 12 to 6mbs) would maybe aid the problem, but how irritating is that. We need the speed because were pulling a lot of gaming groups often. Nothing deathly heavy, just FFXIV online, but when playing, we don't need constant DCs. I'm not sure, but could it be crashing because we are pulling too much for it to handle? Anyhow, iv thought about looking into cable, but would rather keep ATT because we have been with them so long, so is their any way to solve this problem without downgrading speed!? Thank you. 🙂