I have a RadRover 5 HS that was delivered near the end of April 2021.  It has about 120-130 miles on it.  At about 90-100 miles, I started hearing a clank noise (metal on metal sound) coming from what seems like the front crank.  The noise happens near the the bottom of the downstroke of the left pedal.  It is louder when pushing harder (ie - pedaling uphill) and can be barely noticeable pedaling downhill.  I also can feel it very lightly in my left foot when it happens.  Good thing about it is people know I'm coming!   

I know this is not a "good" noise so I need to get it fixed ASAP.  I've checked the cranks to make sure they are on tight.  I looked for any play in the drivetrain and can't feel any using my hands to turn the crank.  Research seems to indicate a loose bottom bracket, but again, I don't feel any noticeable wiggle or play while riding or when I looked closely at it.  One article I read said this is a common problem in new bikes as manufacturers don't want to over tighten these brackets at the factory because there isn't much room for error if it is overtightened. 

Any other thoughts on what this might be before I look even closer?  Thanks in advance!