[ubuntu_mate] My WiFi or my distro? who is wrong?

I just noticed that my Ubuntu Mate 16.04 distro has some issues with coection, i can coect to my house WiFi without any problem at all, however when i use my school's WiFi, everything worked fine the first day but suddenly both access points seem to be unreachable, i say this because when i try to coect to any of them either it keeps asking for the WiFi password or it simply doesn't coect, is there any way to fix this? i've tried to forget both networks and no better results and my phone can coect to School WiFi without problems too, my only option here is to share coection via Usb , im using private drivers for a Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01) WiFi card, but as mentioned earlier i have no problems in my House WiFi.
Is my Ubuntu Mate going crazy? or those WiFi's are acting weird?
Thanks in Advance :B