You would need to perform tests on purchases to ensure you are not dropping any orders.   Did you do a QA of changes and actually test/verify purchases and all related metrics? 

If redesign has caused this to be sure look at things like referring domains, did you lose alot of bookmark and search engine traffic?   Perhaps missing pages need a better redirection strategy if not done so. now

In your case the CRM you use. Is there any credits, cancellations occurring that could also help cause the gap?   Also do a check if there are orders missing from your CRM side is it a few customers only or many different? Can be some IT dept for them have settings that block some analytics tags fro...

Yah check is there a geo IP city/region/country spike on the page?

If your analytics setup tracks tracking IDs then correlate the page against IDs to see if one in particualr is a spiker   Penetration testing can be performed to simulate thousands hundreds of thousands of users. Its an IT function so you need to inquire internally with whomever manages your network...

Check if:   UVs relate to a spike with a particular page Is there and tracking IDs that also spike(perhaps marketing did a social buy?) look at any referring domains that may have spiked Did your IT team try any penetration test    

I would check  IT penetration testing or network blocking happening? Odd how its Microsoft related browser that is tanking the most.   Do most of your customers come from any IT group that maybe has strict Windows security browser settings?

Hi so your 2 beacons are a bit different and at different stages of purchase flow.   Beacon one is pretty easy looks good.   What makes me suspicious Beacon 2, I am wondering how are you creating a purchase event/transaction on the same page?   I would expect once cart add is done you then have user...

Hard to be more detailed but seems data elements or datalayer itself is not intact any more.   Check if you see Content Policy errors as well..(might be new browser version got stricter).  If datalayer is blocked or messing up some data element then this is definitely a source of apparent dropped tr...