BLU Vivo phone filling up in system (com.android.vending/cache)

A BLU Vivo AIR phone 16GB, (no extra sd card), becomes stuck every few days/weeks.. Checking the /data/.. folder noticed this cache directory filling up all the time:

Code:
:/data/data/com.android.vending/cache # ls -l -rw------- u0_a18 u0_a18 55273 2017-01-05 16:37 1468357373244.tmp -rw------- u0_a18 u0_a18 60737 2017-01-05 17:09 1470286953684.tmp -rw------- u0_a18 u0_a18 60737 2017-02-16 16:38 1478228129219.tmp -r-------- u0_a18 u0_a18 35612 2017-02-16 16:39 com.android.opengl.shader s_cache -rw------- u0_a18 u0_a18 35771046 2017-01-10 12:38 gfbfv1-1407321045old -rw------- u0_a18 u0_a18 25312644 2017-02-02 07:43 gfbfv1-1938407551old -rw------- u0_a18 u0_a18 35720303 2017-02-10 08:20 gfbfv1-54134236old -rw------- u0_a18 u0_a18 30249810 2017-02-06 11:52 gfbfv1-755265261old -rw------- u0_a18 u0_a18 30249810 2017-02-11 12:31 gfbfv1-858435026old -rw------- u0_a18 u0_a18 43200757 2017-01-29 10:40 gfbfv1-879983232old -rw------- u0_a18 u0_a18 36155398 2017-01-28 08:57 gfbfv1-943855039old -rw------- u0_a18 u0_a18 31497946 2017-02-02 07:39 gfbfv11084829459old -rw------- u0_a18 u0_a18 21801412 2017-01-10 08:42 gfbfv11421810361old -rw------- u0_a18 u0_a18 42667297 2017-02-14 18:37 gfbfv11487072824old -rw------- u0_a18 u0_a18 33055061 2017-01-15 14:04 gfbfv1157473315old -rw------- u0_a18 u0_a18 62752291 2017-02-06 17:41 gfbfv11708972366old -rw------- u0_a18 u0_a18 43200757 2017-01-27 14:58 gfbfv1570258388old -rw------- u0_a18 u0_a18 73255639 2017-02-12 10:43 gfbfv1572587892old -rw------- u0_a18 u0_a18 73255639 2017-02-11 12:41 gfbfv1824247130old -rw------- u0_a18 u0_a18 43200757 2017-02-01 06:20 gfbfv1927007937old drwx------ u0_a18 u0_a18 2017-02-16 16:38 images drwxrwx--x u0_a18 u0_a18 2017-01-05 16:36 lds drwx------ u0_a18 u0_a18 2017-01-05 16:36 logs drwx------ u0_a18 u0_a18 2017-02-16 16:38 main -rw------- u0_a18 u0_a18 0 2017-01-05 16:36 restore.log

The w/a is to simply rm -f * all these files, then phone goes back to normal.

I didn't capture the contents (next time I will), but wondering if anyone knows what these are?

I suspected google play store, so cleared cache, and it didn't help, still after few days it got filled up again..

any tips welcomed! (this is Android 5.1, latest firmware from Aug 2016 as i recall).

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