Other users have had a similar problem lately. It seems many also have BullGuard Security installed on their machines, and white-listing Maple has fixed the problem.
BullGuard has instructions for this process on its website:
For BullGuard, rules are listed by application, and you would want the policy to be "Allow" and direction to be "In+Out".
Some security software require specific files or folders, though. You can try to white-list the entire
C:\Program Files\Maple 2018\
folder (we're assuming 64-bit Windows and Maple 2018 here), but to include only specific files, you would typically want to white-list these:
C:\Program Files\Maple 2018\bin.X86_64_WINDOWS\cmaple.exe
C:\Program Files\Maple 2018\bin.X86_64_WINDOWS\maplelauncher.exe
C:\Program Files\Maple 2018\bin.X86_64_WINDOWS\maplew.exe
C:\Program Files\Maple 2018\bin.X86_64_WINDOWS\mserver.exe
C:\Program Files\Maple 2018\jre\bin\javaw.exe
The last one in particular, javaw.exe, is what is specifically added to Windows Firewall and others' exceptions when Maple is launched for the first time.