sprint XT1526 cm12.1 build 57, hotspot turn off automatically - E 2015 Q&A, Help & Troubleshooting

it's a sprint xt1526. installed cm-12.1-20150929-UNOFFICIAL-surnia-57 + open_gapps-arm-5.1-mini-20151005. everything works fine and has LTE data but the hotspot shut down by itself while Im tethering (happened twice in about 40 mins) and I have to enable it back manually. can anyone please help?

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