Check your routing table.
You could have two routes to the same destination and one of them is not
working for some reason.
It looks like that
R1#ping 1.0.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.0.0.1, timeout is 2 seconds:
!.!.!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/14/20 ms
Cheers
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