as question suggests, I have no clue why this is happening, i have to reinstall Android module Every day,
before you ask anything, yes i am using latest Unity 2018.3.0f2 and same Android module, i took this problem lightly because i thought reinstalling Unity might solve this, so what I did is reinstalled the Whole freaking fresh Windows (nah I did that for my other personal reason) but problem continued, but I am glad, that I saved setup files, because ever since 2018.3, android module is much beefy size to download everyday, and speaking of version, this wasn’t issue on 2018.2 or before.
and sorry i can’t provide any more details because I have no Idea what so ever, NO Popup errors, NO console Exceptions, Nothing any noticeable about how and when this module gets uninstalled without Notice, or may be it just simply not detecting it. but as after i install Android module back, it detects and works normally. maybe this could happening with other modules as well idk that too.
i’ll perform more tests and update here, and yes i am not reporting bug yet till i found some evidence, or else you awesome guys might already know the fix or known bug in list.