Unsure if anyone has already posted about this, but here goes.
Certain (older) versions of RPGMaker have a bug where rarely, the game will randomly freeze. This happens because the engine skips frames to maintain a stable framerate (or something like that). The code to do this asks JS for the clock times before and after rendering a frame, and skips frames depending on how long rendering took. JS asks the OS for clock times. However, if the OS syncs its clocks in the middle of rendering a frame, the clock time can go backwards. Therefore, RPGMaker gets confused and thinks it needs to skip negative frames, which it can't handle.
The solution is to open www/js/rpg_core.js, go to line 1872, and change
if (this._skipCount === 0) {to
if (this._skipCount <= 0) {The bug also appears in some other (usually old) RPGMaker games, but is fixed in newer versions. And it's really annoying because there's like no information about it anywhere.