Login success extremely sensitive to latency

*I'm submitting a ...*
- [x] bug report
- [ ] feature request
- [ ] support request

## General infomration
If someone else on my network is downloading heavily, I can log onto the kodi youtube plugin fine but the netflix plugin won't log in, will return 'error logging in'.
On the other hand if I log into netflix via a web browser that works fine, and if I get them to stop downloading I can log into the kodi plugin fine. But there seems to be no tolerance for delay or latency.

### Prerequisites

* [x] Are you running the latest version?

### Description

[Description of the bug or feature]

### Steps to Reproduce

1. Reduce the bandwidth of your network, either by starting a heavy download/torrent or something else, so that web browsing takes a while to load pages.
2. Try logging into kodi youtube plugin (should work fine)
3. Try loggin into kodi netflix plugin (should fail)

**Expected behavior:** [What you expected to happen]

**Actual behavior:** [What actually happened]

## Context (Environment)

### Installation

* [ ] I installed the plugin via zip from the Releases page
* [ ] I´m using the Netflix Repo
* [x] I´m using a different source (Please tell which)
Clone zip direct from github page.

### Operating System

* [ ] Linux (x86/x64)
* [ ] OSX (x86/x64)
* [x] Windows (x86/x64)
* [ ] Linux (ARM)
* [ ] Android

#### Additional informatin on the environment

[Descripe your environment a bit more detailed, are you using LibreElec f.e.]

## Debug log

https://pastebin.com/6DQEjW8C

## Other information

[e.g. detailed explanation, related issues, suggestions how to fix, links for us to have context, etc.]

### Screenshots

[Please add a screenshot if that helps understanding your problem]

[You can erase any parts of this template not applicable to your Issue.]

Start by reviewing the linked debug log and reproducing the Netflix plugin login on Windows while the network is bandwidth-constrained; compare it with the Kodi YouTube plugin and browser login described in the issue. Trace the login failure and identify why latency produces “error logging in”; done means Netflix authentication remains reliable under the reported network conditions.

Written by the indexing model from the issue text.