ionic serve yielding unstable server

[ionitron-bot]

Bug Report

Ionic Info
Run ionic info from a terminal/cmd prompt and paste the output below.

$ ionic info
√ Gathering environment info - done!

Ionic:

   ionic (Ionic CLI)          : 4.1.1
   Ionic Framework            : @ionic/angular 4.0.0-beta.5
   @angular-devkit/core       : 0.7.5
   @angular-devkit/schematics : 0.7.5
   @angular/cli               : 6.1.5
   @ionic/ng-toolkit          : 1.0.7
   @ionic/schematics-angular  : 1.0.5

System:

   NodeJS : v8.9.0 (C:\Program Files\nodejs\node.exe)
   npm    : 6.1.0
   OS     : Windows 8.1

Describe the Bug
When I serve any ionic project, including starters, everthing seems to work fine (no errors reported), but the page load fails in the browser (both chrome and firefox). I get "Loading..." on the tab while the source is compiling, but when it is done the page is blank.

If I refresh the page continually (or wait a few minutes and then refresh), it will eventually load.

I have the same problem every time I make any change to the code - I have to wait a few minutes before it will load correctly.

Steps to Reproduce
Steps to reproduce the behavior:

1. Clone blank starter
2. ionic serve

Expected Behavior
It should just work like it used to in the past.

Additional Context
I sometimes get the following error in the console:
Failed to load resource: net::ERR_ADDRESS_IN_USE

If I check the network tab in chrome, I see that some files are failing to load. The failing files change if I continually refresh, but are always some combination of the following files:
styles.js
vendor.js
polyfill.js
main.js