My TJ did a few weird things not so dissimilar a few years ago, it turned out to be slightly bad battery terminal connections. Just whipped them off cleaned them up and banged them back on nice and tight and didn't have that same problem again.
Might help.
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98 TJ: H/Top,4" Lift,RELA, 33's KL-71s,K&N,TBS, BL & MML,Warn FR bar,F&R ARB's @ 4.56:1.
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