Recently I had the same symptoms described in the post. At first it only occurred when I unplugged my phone after waking up to the "Gentle Alarm" app. A screen would appear telling me I now have a intelligent lock screen and provided a number of options that I could active, e.g. weather, horoscope, etc.
I couldn't find anything that related to Gentle Alarm. I ran Malware-bytes and it didn't detect any problems.
I did a search on the files in my phone and found the picture, pwbg.jpg. The picture was the same that showed when the screen appeared in the morning.
I have no idea where is it comes from.
I disabled Peel Remote. I report back if this fixes it.
Tom