My suffering made me the expert on this All of the below is for Android, I do not know about iOS app in this regard. The phone and tablet are quite current. Issue was much worse on the tablet as it has a slower CPU (Samsung Tab A 10.1 from 2019 with Android 10)
Originally I used Tidal for years, long before deciding to go all-in with Naim. Because the streaming company apps have just the binary favorite yes/no choice, I ended up with approx 2000 favorites, as it is the only way if you want to remember something. Annoying but what could I do. Then I started to use a NAD streamer with the Bluesound app, used Tidal from within it without any problem. Then switched to Bluesound Node, also no problem.
Then, last summer, I started to use the Naim app, back then with a Nova, and initially had so many issues that I don’t know anymore what was what, but one major issue from the start was that whenever I woke up the app (from sleeping screen or just by switching from another app) it was unresponsive for 5 or 10 but also up to 30 seconds. So essentially unusable. Reinstallation and so on not helping. What’s worse, you never knew if it was already responsive and when you tried to drag the volume slider while it was still unresponsive, it would then add up the attempted slider movements later, after it had become responsive. So occasionally it would then magically move the slider higher and higher, making you struggle to run to the unit to turn its knob.
After the September app update, the unresponsiveness got better and was “just” 2-5 and up to 10 seconds after every wakeup or app switch. The scary volume behavior did not happen after this update. I asked on the forum, people said “your network”. I contacted the Naim support and they also said “probably your network”. Which I knew not to be true, but of course I complied with whatever the support wanted to do. They scanned my network and it was confirmed that this was not it. As they could not help further and as I could kind of live with the level of unresponsiveness (and using the remotes for volume), I did not pursue it further because it looked hopeless. (There is another user on the forum who also contacted support and unfortunately was told, according to how he described it, that he was using it wrong and should use fewer favorites. Not very satisfying after spending thousands on a streamer, one has to admit).
In Nov, I switched to NDX2 and shortly after to Qobuz. Same problem. I joined the Beta group. While working on a report for an unrelated app issue, I happened to log out of Qobuz. And lo and behold, the unresponsiveness was gone! I could have thought of trying this earlier, but it just never occurred to me.
So I reported this in the beta group where, to the Naim staff’s credit, I was finally taken seriously and indeed it turned out to be a Naim app issue. As a Beta member I shall not speak about what is going on in the Beta, but I believe nobody will be angry with me for saying that I am happier.
Try to log out of Qobuz and see if the overall responsiveness when touching various things in the app improves, in particular after wakeup, then you know if you have the same issue.