I agree that the drip emitters you were using were too small. If you're using 1/2 gph drippers, and had them on for 2 hours per day, that's only 1 gallon of water per day. That might not be enough during hot weather. If you were running the drippers for only 15-20 minutes, then definitely not enough.
I have my tomatoes in 7 gallon grow bags and I'm using 2 gph drippers. I have them on 15 minutes twice a day for now since we're having weather that is in the low 70's but I'll ramp it up once we get to serious summer weather.
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