Http Error when uploading images

First image

https://drive.google.com/file/d/0B8WJm397jOMpMlpRRXFMWURTMzA/view?usp=sharing

This happens when I upload via drag and drop

Second image

https://drive.google.com/file/d/0B8WJm397jOMpa0lzN3NjcExOWVk/view?usp=sharing

Happens when I use the browser uploader.

I contacted my host and they escalated the issue to a technical team but for now I need to know any workarounds.

Methods used:

Plugin deactivation
Emptying cache
Used multiple browsers (Chrome and FF)

I need to know what to do because all my articles are on hold and I can’t publish them without pictures.

P.S. I got a few images in but it’s random/inconvenient. This issue existed in 4.3 but its workaround was to simply save as draft or refresh the browser.