Windows 10 Language Shortcuts Not working in random maer

As In windows 7 and 8 , I Set change language Shortcuts as below,

leftAlt+shift +1 for EN

leftAlt+shift +2 for FR

leftAlt+shift +3 for DE

leftAlt+shift +4 for RU

leftAlt+shift +5 for RU mnemonic

it works after applying the change , but after sometimes It stop working. Sometimes start working after reset and sometimes not