My cacti Graph lost after 5 months

[somdaraz]

Dear All,

My Cacti's graph lost after 5 months, while others are not losing any data.
Note that all graphs are added on the same day, use the same Template, the Same Profile, same devices the only difference is datasource.
Graph OK

Graph OK.png (73.99 KiB) Viewed 453 times

Graph losing data.

Graph Lost 5 months.png (69.56 KiB) Viewed 453 times

Anyway how can I troubleshoot about this issue ?

Cacti Info
Cacti Version 1.2.15
Cacti OS unix
NET-SNMP Version NET-SNMP version: 5.7.2
RRDtool Version Configured 1.7.1+
RRDtool Version Found 1.7.1

[TheWitness]

Post a screen shot of your data source profile specification showing all the intervals.