I have a problem where my downloads are sometimes assigned a random name like "tmpEc98" or something like that, rather than the actual file name from the website. This happens with the batch download feature.
A workaround I've found is to restart the application and try again, most of the time it works, but sometimes the problem is very persistent.
Unfortunately it seems like this is an issue that is very rare since I couldn't find any relevant information regarding this problem anywhere.