CollectionSearchIndexAttributes keeps needing repairing

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Hi
Lately my site keeps needing the CollectionSearchIndexAttributes to be repaired. After a while I notice its stopped working again and have to go into phpMyAdmin and it shows that it is in use.

this is what I get when I run analyse
pebble_pebbleA.CollectionSearchIndexAttributes   analyze   Error   Table './pebble_pebbleA/CollectionSearchIndexAttributes' is marked as crashed and should be repaired
pebble_pebbleA.CollectionSearchIndexAttributes   analyze   Error   Table 'CollectionSearchIndexAttributes' is marked as crashed and should be repaired
pebble_pebbleA.CollectionSearchIndexAttributes   analyze   error   Corrupt


and when I run repair
pebble_pebbleA.CollectionSearchIndexAttributes
repair
info
Found block that points outside data file at 11151...
pebble_pebbleA.CollectionSearchIndexAttributes
repair
warning
Number of rows changed from 6030 to 6034
pebble_pebbleA.CollectionSearchIndexAttributes
repair
status
OK


Any ideas on why this keeps occurring and only on CollectionSearchIndexAttributes table?