Since we’re spitballing – my guess is it’s a race condition with the downloading: in other words, multiple pieces of the map (for example) are being downloaded in parallel. There are many subtle ways for them to trip over each other in the code.
The 0xc0000005 error basically means that something is going wrong when trying to access RAM. The more bandwidth, the quicker those downloads complete, and more chances there are for timing issues (e.g. one part yanking the rug out from another)…
In any case with all the CTDs, looks like I picked the wrong week to stop sniffing glue try the 787 tutorial (Overhaul suggestions for World Map page - #9 by darkmark327)