I'm a current user of the Nokia 6 and have been since August, and have been a long time user of Lumia devices before that, so it's safe to say I'm a fan and someone who generally sticks up for the Nokia brand. However there have been some very troubling issues with the Nokia 6 that have affected me - which I have largely fixed because I'm something of a power user, but which have been very widespread and which Nokia hasn't addressed.
Recent updates to the Google clock and messaging apps cause them to be totally unreliable for receiving messages and for alarms. A wake-up alarm not working is a serious problem. Not receiving/sending roughly half of text messages is serious! And if you read Amazon's customer reviews for the 6 right now, you can see that it's hurting the brand and the phone. What gives?
Granted, I've fixed both issues for myself. The messages app I rolled back to the previous version, then deselected the auto-update feature to keep it at that version. I solved the clock problem by downloading a new clock app. I've been suggesting these to the angry Amazon reviewers in comments, but it's obvious that this is a black eye that I don't feel like HMD can afford at this point in their short timeline. Can we at least get an acknowledgement on the specific issues that so many people are having? The tone deaf responses which Nokia meets these posts with only adds to the problem.