Samsung Galaxy Tab Model SM-T800 running Android v5.0.2. 16gb internal, 60gb external. Latest version of Cool Reader from Google Play.
Cool reader crashes constantly, sometimes with error, sometimes without without. About 80% of the time it's when changing chapters in books. I read ePub exclusively. This happens on any file. I have run a number of different ePub files from different sources to find out if the files are at fault, they are not. I now "save" ( exit and restart CR) to save my place regularly.
I have removed and reinstalled Cool Reader. No Joy.
I store my ePub files on my SD card. I have tested them on my internal storage. Same thing. I have run the app both internally & externally, same results.
I have had no crash problems on any other app on this device which I use regularly.