The BOLT definitely must NOT be connected via the Tuning Adapter's pass-through RF/STB Out port. As you've read, you'll want to use a MoCA-compatible splitter (ideally) to connect the TA and BOLT directly to the coax line, rather than daisy-chained. Keep in mind that you may also want to install a "protective" MoCA filter on the input of the Tuning Adapter, to protect it from MoCA signals which have been seen to disrupt TA operation. (see here for more info)
p.s. This isn't to say that correcting the setup per the above will resolve your current issue if the root cause is elsewhere, but the "parallel" connection is needed to ensure relaible MoCA (and TA) operation.
I'm also curious about your type of residence (single family home, apartment, condo?) and whether you know if you have a "PoE" MoCA filter installed to secure your MoCA network? (see here for info on "PoE" MoCA filters)
At this point, I'd recommend getting the BOLT & TA properly connected, and then doing a full power reset of your gear, ensuring your TiVo, MoCA adapter, modem, router are all powered down for a few minutes. Bring the modem and router back up first, followed by the MoCA adapter and then the BOLT.
A full power reset has been seen to resolve puzzling MoCA issues in the past.
A forum community dedicated to TiVo digital video recorder owners and enthusiasts. Come join the discussion about programming, streaming, content, schedules, home theaters, displays, models, reviews, accessories, classifieds, and more!