sensor - int16_t to float MPU6050 accel reading overflow in arduino -

i'm having trouble identify why strange values , overflow mpu6050 sensor. have atm328p micro reading values drotek 10 dof imu sensor, 1 of these values acceleration one, , become ovf or behaves in weird way. code i'm using it:

#include<wire.h> const int mpu=0x69; int16_t ax,ay,az; float acc[3] = {0, 0, 0}; float s = 0.00006103515625; // scale factor g/lsb 4/65536  void setup(){   wire.begin();   wire.begintransmission(mpu);   wire.write(0x6b);  // pwr_mgmt_1 register   wire.write(0);     // set 0 (wakes mpu-6050)   wire.endtransmission(true);   serial.begin(115200); } void loop(){   wire.begintransmission(mpu);   wire.write(0x3b);  // starting register 0x3b (accel_xout_h)   wire.endtransmission(false);   wire.requestfrom(mpu,6,true);  // request total of 14 registers   az=wire.read()<<8|wire.read();  // 0x3b (accel_xout_h) & 0x3c (accel_xout_l)       ay=wire.read()<<8|wire.read();  // 0x3d (accel_yout_h) & 0x3e (accel_yout_l)   ax=wire.read()<<8|wire.read();  // 0x3f (accel_zout_h) & 0x40 (accel_zout_l)   acc[0] = ax*s;  acc[1] = ay*s;  acc[2] = az*s; } 

why these last acc values array overflow or behave in weird way (not expected values) sometimes, , why when starts behaving weird doesn't recover anymore? i've looked problems regarding int16_t float conversion haven't found clue me. here there similar issue, think won't apply mine cause ax, ay , az values sensor far away limits, , i'm converting larger format number.

does have idea?

i'm starting think may hardware thing.