What to do when widget is not refreshing

It is hard to guess what it root cause that causes that our app is not refreshing. Here is list most common root causes:

• You installed some kind of task killer/battery saver/memory cleaner that aggressively kills other apps. Exclude our app from the list of killed apps and/or uninstall that aggressive app. You will get more stable Android.
• Don't be tempted to tweak your battery life by changing anything in developer options (eg. by reducing background processes limit or by forcing activity close). Those tweaks are for stress testing only.
• Don't use tools like Greenify, Clean Master, Zapper Task Killer or any Antivirus software that kills other apps.