Frequent freeze-ups of M2U

Seems like some random and rare glitches with memory happening at different addresses. Results of 100 runs of memtester:

pagesize is 4096
pagesizemask is 0xfffff000
want 100MB (104857600 bytes)
got 100MB (104857600 bytes), trying mlock ...locked.

Block Sequential :FAILURE: 0xa0a0a0a0 != 0xa020a0a0 at offset 0x025f41ac.
Block Sequential :FAILURE: 0x99199999 != 0x99999999 at offset 0x026e9530.
Solid Bits :FAILURE: 0xff7fffff != 0xffffffff at offset 0x016ddfb0.
Bit Flip :FAILURE: 0xff7ffff7 != 0xfffffff7 at offset 0x010390b0.
Bit Flip :FAILURE: 0xffdfffff != 0xff5fffff at offset 0x003db12c.
Bit Flip :FAILURE: 0xff6fffff != 0xffefffff at offset 0x0301a830.
Bit Flip : FAILURE: 0xfe7fffff != 0xfeffffff at offset 0x002abeb0.
Bit Flip : FAILURE: 0xfffff7ff != 0xff7ff7ff at offset 0x00c5152c.
Checkerboard : FAILURE: 0xaaaaaaaa != 0xaa2aaaaa at offset 0x01e91b2c.
Bit Spread : FAILURE: 0x00200000 != 0x00a00000 at offset 0x01a6af30.
Bit Spread : FAILURE: 0x00200000 != 0x00a00000 at offset 0x0099adf0.
Walking Ones : FAILURE: 0xfffffffb != 0xff7ffffb at offset 0x0051242c.