About two days ago, I received this notification. At first, I just click on "Change",and in setup, set default storage to SD Card. I'm using Android 4.2.2.
But, this is happening in every half hour... I rooted my phone about 2 mounts ago,installed link2sd,and created second partition on my 16Gb SD Card. Both partitions are marked as Primary and both are FAT32. It's worked very well until 2 days ago. When I receive notification about SD Storage, my whole second partition stop working. Every apps on second partition is "unreachable" and I must restart my phone.
Do you know how to "fix" this, because, my SD Card is ok,it's seems that android unmount and mount SD Card and show this notification automaticly.
I forgot to mention, when I format whole SD Card,and delete second partition, this notification is not showing,but,again,when I create second partition, notification is shown on my home screen,and keep asking me to change default storage.