Just an update: it HAD to be the bulb. Last night I swapped in the 5 COB led bulb, and the issue went away. Thanks to everyone with their contributions, more often than not, many minds are better at diagnosing than just one. Your time is truly appreciated.
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Rides a 2016 Bashan 18C with Blue PlastiDip, piped and jetted, USB charger, real-time digital volt meter, faux carbon fiber handguards, 5 COB led headlight upgrade, auxiliary led light bars, and an MSR shift lever with new grips, T6 aluminum handlebars anodized in blue, polished handlebar brace, decals, HD Unibear chain and spoke covers waiting on the always-full mod shelf......
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