With the S5e it is a known hardware issue, down to the location of the WiFi antenna. When holding the tablet with the camera on the top left, and your hand on the right side below the charging port. You can block the WiFi antenna enough to completely drop ur wifi. Often times it can just cut your signal strength down, but i and others have experienced completely loss of signal and a disconnection, until u move ur hand out of the way.
A "fix" for this is to either hold it somewhere else, or rotate the tablet so the camera is now on the bottom right instead, basically u don't want to block the WiFi antenna.
As for ur A10 i cant offer any advice unless the 2 are connected by a similar issues such as a poor router or weak signal.