For this raster (4328 x 6123 pixels), Try 4x4 and increase overlap to 300x300
You would want to keep adjusting till you get it because you need to avoid edge artifacts (using too large over lap and small number causes this)
If it doesn’t work, try 5x5 at same 300x300 but work would be slower. I hope you have enough RAM (32/64Gb) and enough cores (like 10-15 usable) to dedicate to it in the snaphu unwrapping setting (No of Processor)
It is aborting because tile is inadequate with overlap (too large or too small), or there is poor coherence in the area. After your Interferogram formation, did you check your coh product? If you have too may black pixels than white, then the coherence is very low and is part of the reason. You would need whiter pixels or gray colored. Typically, coherence ranges from 0 to 1 with 1 being the highest. Your image should tend more towards 1 as it is not recommended to consider pixels below 0.3. Also, the reason your coherence might be low is if you use two image pairs far apart in baseline. You would need to keep a 12 to 36 baseline but the closer, the better your coherence.