Default Bionic reboot issue

I recently bought a battery for my xt8 75 and I have been carrying a boot loop device will power on and will reboot sporadically I have flash the RSD Lite fastboot files for 58 893 and 5 7893 and have attempted to flash the 4.1 2 updates with failure basically the flashes not improved the behavior except this one time the status bar showed a sim with an exclamation point message and the device was fully operational until I attempted the radiocomm GSM mod and the device returned to the previously mentioned crappie behavior. I flashed the fastboot files several times after and have not been able to repeat the success. Does anyone know what I can do to get the device stable?

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