I would really like to know the answer to that ("why"). My most recent experience is with a Motorola Nexus 6 -- worked great for the first couple years after I

I would really like to know the answer to that ("why"). My most recent experience is with a Motorola Nexus 6 -- worked great for the first couple years after I got it. But recently a lot of things have been really glitchy. For example, Android Auto takes about 15 minutes to come fully alive, find my position, and plot a route when I plug it into my car. And video playback started stuttering bad. And the CPUs were maxed out periodically I've uninstalled all third-party apps, cleared cache, and that fixed the issues for about a week, then they all came back. Only thing I didn't do is reflash back to factory defaults. Bought a Pixel 2 to replace it, and am wondering how long it will last. BTW, this has also been the same experience with several family members, mostly with Samsung android phones -- they work great for a couple years, then start slowing down.