Due to much wireless interference where I live, wi-fi is very low compared to what my Internet service can give me. Out of 100/20 Mbps, I get 2.6 Mbps download at most on my #Mobian #Pinephone. The kicker is I can upload up to 6 Mbps. (I had the same issue on Ubuntu Touch on a OnePlus One)
But after a couple of days, wireless degrades to ridiculously slow speeds (below 0.5 Mbps). Needless to say it becomes impossible to browse. Rebooting appears to temporarily fix the issue.
@lucifargundam
Thanks for the suggestion! I installed it. Every time I launch the app, it tells me my device (broadband module) is disconnected. I clicked the Activate button the first time. A few hours later, texts that had been queued for days were abruptly received. I have no idea if it's related to my using Modem Manager GUI.