I replaced the map with a different map, took some of the pre battle events out (the bandit who left bone in charge is not on the map anymore) and yeah. Whenever the map opens it glitches up and then moves to a non glitched up picture of the map, and then freezes 
Are you using the world map at all? I ask because I had a similar problem. The game tries to initialize the world map for the first time at the beginning of chapter 2 and if you aren’t using it, it can lead to problems. There are fixes though, someone here helped me solve the problem.
I’m just not sure if your issue is the same as mine, since my game would freeze as soon as the chapter 2 disappeared.
The world map works fine. At least before the chapter
In FE 8, there is a map which freezes unless it enters from the world map.
The following patch is necessary to release this restriction.
“Eliminate the constraint of freezing unless it enters from the world map”
In addition, some maps are restricted.
Because it is Japanese content, please read with google translation.
http://ngmansion.xyz/wiki/hackfe/index.php?縛りがかけられているマップ
Unfortunately, I have no idea how to download that, and I entered from the world map and it still crashed
I’m going to see if it’s possible to bypass the glitched chapter entirely