I have the exact problem. While hot spot is on, my data goes on and off. BUT... It's only on touchwiz roms. 4.2.2 AOKP, CyanogenMod, Liquid Smooth all work flawlessly. I've also tried every TW ROM I could find and no matter which I use, the data drops while using hotspot. Mean Bean, Clean ROM and Jelly Beans all have the problem. Although I can't say why, I'm confident it's TW. I've even tried unrooted, stock TW. Even with the folder issue of jumping between 4.1 and 4.2 my weekdays are spent on Jelly Beans and evenings/weekends on Liquid Smooth. I need s-pen features for work and hot spot for home. It's a pain but I've found no other solution. Drives me crazy! I'm tired of organizing my storage and the twice a day backup/restore. I'd love to find a fix...