Glass Top Cracking

Question

My countertop down draft glass top was new in2000 installed in my new home. 5 yrs, and 6 months later the top cracked. Warranty was over at 5 years. Ordered a new top from the company this was installed and 1 year later the top cracked again in the same area as before. I was told there is 90 days on replacement.another top was ordered and installed 9 months later cracked in same place. Another top was ordered and this time we tore the top off the entire island and installed a new absolute level top the new top was installed by authorized service man. sworn to be level. 4 months have passed this top has cracked in the same area. I am a senior citizen and I can notr repeat purchases like this at $.400. Help