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Data Protector Express 3.50 writes to tape less then 400Gb

 
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Data Protector Express 3.50 writes to tape less then 400Gb

Backup Job runs every day for year. Everything was OK: on each tape was writing about 370Gb. But week ago I discovered that in tape writes many less 370Gb.

Statistics of tape, which writing year ago:
Media type: LTO-3
Size written: 377.99 GB
Native total capacity: 390.92 GB
Native remaining capacity: 18.08 GB

Statistics of last writing tape (same job):
Media type: LTO-3
Size written: 206.45 GB
Native total capacity: 390.92 GB
Native remaining capacity: 1.32 GB

In my tests I tried to write the data by another job: when I write 10Gb, remaining capacity reduces to about 18Gb. Why it happens?

All files are zipped, size is about 600Mb. All compression is off. There is no errors during writing, no errors on Autoloader.
OS: Linux HREL4 (I was testing on both Linux and Windows, the same problem occurs)