Cisco CCNP and CCIE Study Notes

Consider a fully-meshed frame-relay network with three routers. The three routers are connected to the the frame relay cloud with the IP addresses 10.10.10.1, 10.10.10.2 and 10.10.10.3 respectively. However, the neighbor relationship on all the routers constantly keeps getting reset with messages like the following -

*Mar  4 16:10:01.333: %OSPF-5-ADJCHG: Process 100, Nbr 10.10.10.3 on Serial2 from LOADING to FULL, Loading Done
*Mar  4 16:10:05.261: %OSPF-5-ADJCHG: Process 100, Nbr 10.10.10.3 on Serial2 from FULL to DOWN, Neighbor Down: Adjacency forced to reset
*Mar  4 16:10:05.521: %OSPF-4-NONEIGHBOR: Received database description from unknown neighbor 10.10.10.3
*Mar  4 16:10:08.813: %OSPF-5-ADJCHG: Process 100, Nbr 10.10.10.2 on Serial2 from EXSTART to DOWN, Neighbor Down: Adjacency forced to reset
*Mar  4 16:10:11.485: %OSPF-4-NONEIGHBOR: Received database description from unknown neighbor 10.10.10.2
*Mar  4 16:10:12.593: %OSPF-5-ADJCHG: Process 100, Nbr 10.10.10.3 on Serial2 from LOADING to FULL, Loading Done
*Mar  4 16:10:14.905: %OSPF-5-ADJCHG: Process 100, Nbr 10.10.10.3 on Serial2 from FULL to DOWN, Neighbor Down: Adjacency forced to reset
*Mar  4 16:10:19.013: %OSPF-5-ADJCHG: Process 100, Nbr 10.10.10.2 on Serial2 from EXCHANGE to DOWN, Neighbor Down: Adjacency forced to reset

Given just this information, can you determine what the problem might be here?