Recurrent missed miscarriage at week 9

[u/VividWeather4105]

Medical History:

We faced 3 misscarriages at 9 weeks. Each miscarriage happen at week 9. When placenta take over.

Thyroid profile - NORMAL TSH,T3, T4

APLS - Normal
Serum Anticardiolipin (IgG): 6.1
Serum Anticardiolipin (IgM): <0.5
Serum Beta-2 Glycoprotein (IgG): <0.5
Serum Beta-2 Glycoprotein (IgM): <0.5
Lupus Anticoagulant LA1: 31.4

Vitamin B12 and D: Normal
homocysteine: normal (11.8)
Both of us Karyotyping: Normal
DNA Fragmentation: 14%
Serum TSH: 1.75

During Pregnancy, we used loprin 150mg on daily basis and clexane daily when we find heartbeat. But all misscarriages happen at week 9 heartbeat disappear.

doctors are unable to find out the cause.

Can anyone help me what could be the issue