[Cache] Cache does not invalidate during runtime

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

## General infomration
The show "Stranger Things" does not appear on any lists whatsoever.

### Prerequisites
None.

* [X] Are you running the latest version?

### Description

Stranger Things appears to me on my PC on the lists Netflix Originals, Top Picks, New Releases and on My List, but doesn't appear on any of those in the Kodi plugin.

I added it on My List (which only has 1 show, Friends), and only Friends appears.

I also tried the Search feature, does not return the show (tried searching for "stranger things" and "Stranger Things").

### Steps to Reproduce

1. Open any of the lists described above
2. Look for Stranger Things

**Expected behavior:** Find and watch Stranger Things.

**Actual behavior:** Can't find the show.

## Context (Environment)

### Installation

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

_I intalled directly from source code the first time, did not work as well. So I decided to unninstal and install from repo to receive updates. I deleted all files before re-installing._

### Operating System

* [ ] Linux (x86/x64)
* [ ] OSX (x86/x64)
* [ ] Windows (x86/x64)
* [X] Linux (ARM Pi2)
* [ ] Android

#### Additional informatin on the environment

Using libreelec test build 1027: [link](https://forum.kodi.tv/showthread.php?tid=298461&pid=2660293#pid2660293)

## Debug log
Log file opening the addon and selecting "My List", which shows only "Friends" and should show "Stranger Things" as well.
[http://paste.ubuntu.com/25839536/](http://paste.ubuntu.com/25839536/)

## Other information

Stranger Things season 2 was released yesterday, this could be an issue related to any new show (but I'm just speculating).

### Screenshots

[My List on PC (Chrome)](https://i.imgur.com/DXZYCCn.png)
[My List on the Pi](https://imgur.com/a/eqqRh) (Sorry for the photo)