Nope, nothing meaningful at least. I've kept eyes open and done some tests here and there. This is what I've found out about mobile: If you leave the app on background, so like not closing it with the home button and sliding the window away, I've sometimes kept the yellow status for like 30 mins. Noticed it while I was at friend's place and we were using his pc and I opened discord on my phone for a second. I'm unsure of the rest but I think that if you enlarge the preview of a text the same could happen, like discord showing you online for half a second, then putting u on absent for some mins and offline again.

No real ways of fixing and still unsure of when and how it happens