I would recommend contacting Rode technical support and make sure to have recording samples handy. Call Rode by phone, as it definitely was faster than opening a ticket or emailing.
Hmm, that may be a bit tough. Sometimes, the Amazon seller may not be a licensed distributor. I purchased mine through B&H for those very reasons…But it’s at least worth the try. If you haven’t tried this yet, download a new version of the Rode Central app, then connect your Wireless Go II devices to update the firmware. Please let me know if the clicking noises improve from just those two things!