I have learned from friends and family that they sent me messages which I never received. Some were MMS group messages; some were regular SMS (I think).
I get most messages though, it seems. Just a few don't get through. But that's enough to cause major problems.
Using a Galaxy S10 with Android 12.
Possibly a duplicate of #1882
I don't know that I can reliably reproduce the issue. As I said, it's a sporadic failure. Probably the sort of thing that would only be caught be a really rigorous program of testing. Since it's a non-event when the failure happens, it's hard to investigate it. By the time two weeks or a month later that I learn I missed a text, it's too late.
Receive all messages---or at least have the usual rate of failures.
Of course, it is possible that it's a problem with my OS or my mobile service---only time using a different app will tell. But for now, it seems that QKSMS is the likely source of the problem. I will update / close this issue if I find other apps dropping messages in a similar manner.
As noted in #1881, it seems from the commit history that this project is not being actively developed anymore. I think the loss of messages like this will be my reason for switching to the much-hated Google Messages. It's a shame, but I want to put the notice out there that QKSMS may not be a safe custodian of your text messages these days. Unless it gets refreshed and better tested, I will have to look elsewhere.
That said... this was otherwise a really awesome app. No nonsense. Google Messages is like selling your soul by comparison. Thank you very much to @moezbhatti for producing it!