diff --git a/python/__init__.py b/python/__init__.py
index 1f95008f712..6c714ca3b59 100644
--- a/python/__init__.py
+++ b/python/__init__.py
@@ -7,7 +7,6 @@
 import hashlib
 import binascii
 import datetime
-import warnings
 import logging
 from functools import wraps
 from typing import Optional
@@ -427,7 +426,7 @@ def usb_list(cls):
               if len(serial) == 24:
                 ret.append(serial)
               else:
-                warnings.warn(f"found device with panda descriptors but invalid serial: {serial}", RuntimeWarning)
+                logging.warning(f"found device with panda descriptors but invalid serial: {serial}", RuntimeWarning)
             except Exception:
               continue
     except Exception:
@@ -464,23 +463,21 @@ def connected(self) -> bool:
   def reconnect(self):
     if self._handle_open:
       self.close()
-      time.sleep(1.0)
 
     success = False
     # wait up to 15 seconds
-    for i in range(0, 15):
+    for _ in range(0, 15*10):
       try:
         self.connect()
         success = True
         break
       except Exception:
-        logging.debug("reconnecting is taking %d seconds...", i + 1)
         try:
           dfu = PandaDFU(self.get_dfu_serial())
           dfu.recover()
         except Exception:
           pass
-        time.sleep(1.0)
+      time.sleep(0.1)
     if not success:
       raise Exception("reconnect failed")