Existance of a circular reference can cause this problem. i.e. even if you undef $self->{dbo}, there exist some reference to same object. So its not removed from memory.
Here is a very simple problematic case for circular reference.
foreach (1..5) {
my $a;
my $b;
$a->{b} = $b;
$b->{a} = $a;
} # since both are pointing to each other they will never get coll
+ected.
Please check your code for any circular reference.
you may try disconnecting the database handle just before you undef the $self->{dbo} as an immediate fix.
Cheers !
--VC
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