Wiko devices are however definitely problematic in terms of non-standard background process optimizations and adjustments to the settings that need to be done to make apps work properly.
Turn off Eco.Mode and disable Optimized mode
Go to Phone assist
Tap on Power Saver
Turn off Eco. Mode
Tap on Optimized mode
Disable Optimized mode and make sure your app is not optimized
Add app to background whitelist
Go to Advanced settings
Tap on White-list apps background
Find your app in the list and enable it
Go to dialer and put the code *#*#86569726#*#* and uncheck Lowram Enable And Background enable.
Note: This needs to be done again after reboot.