Sql query hangs close to the end

Hi:
I am on 10.2.0.3.
My rather simple query hangs for a few minutes close to the end. It's supposed to return 288 rows and it immediately returns 285, then hangs for 4-5 min, than returns the remaining 3 rows. Kind of similar behavior to using "First_rows" hint - which I'm not using...
The table has about 100,000 rows.
Some relevant info is below.
Any ides appreciated.
TIA
PLAN_TABLE_OUTPUT
Plan hash value: 2481764356
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 30 | 3 (0)| 00:00:01 |
|* 1 | INDEX RANGE SCAN| PSACOMBO_DATA_TBL | 1 | 30 | 3 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - access("SETID"='GLOBL' AND "PROCESS_GROUP"='100ACDTPRJ' AND
"COMBINATION"='100ACDTPRJ' AND "VALID_CODE"='V')
optimizer_dynamic_sampling integer 6
optimizer_features_enable string 10.2.0.3
optimizer_index_caching integer 25
optimizer_index_cost_adj integer 75
optimizer_mode string ALL_ROWS
optimizer_secure_view_merging boolean TRUE
unnestsubquery boolean FALSE

You said the query is supposed to return 288 rows, but from the explain plan, Oracle "see" only 1 row to be returned. Are the stats up-to-date ? What's the actual query ?
Please, on the forum side, use tags before and after your code to keep it readable (preserve blanks and tabs).
Nicolas.

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