It seems when I open a lot of series pages (via Google) for example in succession, I'll get logged out and have to log back in.

Is this an intended feature?

I've never experienced this, and I open a lot of series pages... Do you have instructions that will reproduce this bug 100% of the time?

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A just ruler amongst tyrants

To be honest I have had this problem for years. Randomly getting logged out.

It's very irregular so I don't know what's the specific trigger for me. I do use Chrome.

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I do use Chrome too. Maybe an extension is the culprit? Could also be a Chrome-Bug related to a corrupted local Profile (regarding Cookie-storage?), though that seems unlikely because this happens during a session.

Or a http/https-transition issue with the cookies?
(Tested it: Nope, works fine. /r/manga 's bot links to the http-Version though.)

Basically it goes like this:
1. Search for a series ((Japanese) name) on Google (sometimes limited to mangaupdates.com)
2. Open the Series-page in a new tab.
3. Go to 1 (most of the time without looking at the opened tab)

Then a few 30-100 (?) tabs later I notice that I've been logged out.

Is there a rate limit for logged in users?

I was able to replicate a logout by opening a https-link (from a google search result) to a series page multiple times in short succession.

(This kind of pattern manifests itself over time, when I look up a list of manga series (each name a separate google result) and try to open their Mangaupdates pages.)

Side-note: Have you considered using the last-modified time of a series page (and a short usually static text e.g. "Design0" or "ActivePoll1234" or "Version10ForBadBrowser1") as an Etag to support caching series pages?

This should mesh well with non-users and logged-out users.
For logged-in users the current status could be loaded in via JavaScript, while keeping the Series page static and cache-able.
The poll could also get loaded in once via cache-able API.

I had the same problem yesterday, however it only happened once. The weird thing is after I logged in again, the series page I was on did get a corrupted picture: https://www.mangaupdates.com/series.html?id=141578

I don't know what happened, but before I needed to log in again, the picture was still fine.

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Even after dead, we raise from the ashes for the sake of manga.

It's been happening to me for a couple of years now, but mostly when users link to a page using the [m][/m] feature.
It also occasionally happens when they post direct links too, like https://www.mangaupdates.com/series.html?id=13783 for example.

Odd thing is, if I posted the manga via either of those methods and clicked the link, I wont be logged out. Only from other users.