"System.OutOfMemoryException" when querying a table with many columns (4311199)

I have an Oracle table with 86 columns most of which are varchar(1000) . Most of the columns are Null, but where there is data, no more than 230 chars but mostly around 30 chars. When I run a 'select * from table', the query runs successfully and returns the required 6000+ rows. However, when running it a second time, it errors out with an 'Out of memory' exception error at 1620 rows.

"System.OutOfMemoryException

Exception of type 'System.OutOfMemoryException' was thrown.

Stack Trace:

at Devart.Data.Oracle.OracleDataReader.a()

at Devart.Data.Oracle.OracleDataReader.Read()

at Quest.Toad.Db.ToadDataAdapter.InternalReadBackground()..."