about twice a day solaar takes 100% CPU. A strace on the process shows continuous :
stat("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/solaar.mo", 0x7ffcf2746a10) = -1 ENOENT (No such file or directory)
stat("/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/solaar.mo", 0x7ffcf2746a10) = -1 ENOENT (No such file or directory)
stat("/usr/share/locale/en_US/LC_MESSAGES/solaar.mo", 0x7ffcf2746a10) = -1 ENOENT (No such file or directory)
stat("/usr/share/locale-langpack/en_US/LC_MESSAGES/solaar.mo", 0x7ffcf2746a10) = -1 ENOENT (No such file or directory)
stat("/usr/share/locale/en.UTF-8/LC_MESSAGES/solaar.mo", 0x7ffcf2746a10) = -1 ENOENT (No such file or directory)
stat("/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/solaar.mo", 0x7ffcf2746a10) = -1 ENOENT (No such file or directory)
stat("/usr/share/locale/en/LC_MESSAGES/solaar.mo", 0x7ffcf2746a10) = -1 ENOENT (No such file or directory)
stat("/usr/share/locale-langpack/en/LC_MESSAGES/solaar.mo", 0x7ffcf2746a10) = -1 ENOENT (No such file or directory)
(my locale is en_US.UTF-8)
WOrkaround is to stop solaar then start it again.